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IWC Portuguese Tourbillon 44.2mm India, Gurgaon
IWC Portugieser Tourrbillon Mystere in 18 Ct. Red Gold Limited...
Rs. 3,612,298
Private Seller
IN
IWC Portuguese Hand-Wound Steel 43.2mm White
TOP
IWC Portugieser Hand Wound Eight Days 150 Years
Rs. 736,874
Verified Dealer
714
UK
IWC Portuguese Hand-Wound Steel 44mm Silver Arabic numerals
IWC Portuguese/Portugieser Hand-Wound
Rs. 428,508
Verified Dealer
1200
NL
IWC Portuguese Chronograph Steel 41mm White
IWC - Portuguese Automatic Chronograph
Rs. 464,969
Verified Dealer
 
DE
IWC Portuguese Automatic Steel Blue Arabic numerals
IWC Portuguese Automatic 500112 Laureus Limited
Rs. 680,807
Verified Dealer
11
CH
IWC Portuguese Chronograph Steel 40mm Blue
IWC Portugieser Ref. IW371491
Rs. 456,541
Verified Dealer
369
NL
IWC Portuguese Automatic Steel Black Arabic numerals
IWC Portuguese Automatic
Rs. 782,928
Verified Dealer
12
EE
IWC Portuguese Perpetual Calendar Rose gold 44.2mm Black Arabic numerals
IWC Portuguese Perpetual Calendar Rose Gold IW502103
Rs. 1,321,567
Free shipping
Verified Dealer
89
IT
IWC Portuguese Perpetual Calendar Rose gold 44mm Black Arabic numerals
IWC Portugieser Perpetual Calendar
Rs. 1,808,573
Verified Dealer
 
CH
IWC Portuguese Perpetual Calendar Rose gold 42.5mm Silver Arabic numerals
IWC Portuguese Perpetual Calendar IW502213
Rs. 1,320,002
Free shipping
Verified Dealer
428
UK
IWC Portuguese Chronograph Steel 41mm Silver Arabic numerals
IWC Portuguese Chronograph 371401 Full Set with Stickers
Rs. 344,408
Free shipping
Verified Dealer
31
ES
IWC Portuguese Chronograph Steel 41mm White Arabic numerals
IWC Portuguese Chronograph - Ref. 3712 - mit Box
Rs. 423,702
Verified Dealer
21
DE
IWC Portuguese Hand-Wound Rose gold 43mm Silver
IWC - IWC Portugieser
Rs. 848,753
Verified Dealer
 
DE
IWC Portuguese Chronograph Steel Silver Arabic numerals
IWC Portuguese Chronograph - Blue Numbers - 371446
Rs. 381,197
Verified Dealer
246
US
IWC Portuguese Chronograph Steel 41mm Black
IWC Portugieser Ref. IW371447
Rs. 460,546
Verified Dealer
369
NL
IWC Portuguese Automatic Steel 42.3mm Silver Arabic numerals
IWC Portuguese Automatic
Rs. 782,928
Verified Dealer
12
EE
IWC Portuguese Automatic Rose gold 42.3mm Champagne Arabic numerals
IWC Portugieser 7- Days Rose Gold
Rs. 1,021,211
Verified Dealer
1200
NL
IWC Portuguese Chronograph Steel 41mm White
IWC - Portuguese Automatic Chronograph
Rs. 464,969
Verified Dealer
98
SE
IWC Portuguese Chronograph Steel 40.9mm White Arabic numerals
IWC Portugieser Chronograph IW3714-46
Rs. 395,719
Free shipping
Verified Dealer
622
US
IWC Portuguese Automatic Platinum 42.3mm Silver Arabic numerals
IWC Portuguese Automatic 7days
Rs. 1,623,886
Verified Dealer
5
KR
IWC Portuguese Automatic White gold 42mm Grey Arabic numerals
IWC Portuguese 7 Day White Gold IW500106 - W4311
Rs. 1,137,842
Verified Dealer
273
UK
IWC Portuguese (submodel) Steel
IWC Portugieser Regulateur Edition Wempe 125th
Rs. 873,035
Verified Dealer
 
DE
IWC Portuguese Chronograph Steel 41mm Silver
IWC ポルトギーゼ クロノグラフ IW371417
Rs. 402,491
Free shipping
Verified Dealer
247
JP
IWC Portuguese Chronograph Steel 41mm White
IWC Portugieser Ref. IW371445
Rs. 456,541
Verified Dealer
369
NL
IWC Portuguese Automatic Steel 42.3mm Blue Arabic numerals
IWC Portuguese Automatic
Rs. 812,964
Verified Dealer
12
EE
IWC Portuguese Chronograph Rose gold 41mm Black Arabic numerals
IWC Portugieser Rattrapante Rose Gold
Rs. 824,978
Verified Dealer
1200
NL
IWC Portuguese Hand-Wound Rose gold 43mm Silver
IWC - IWC Portugieser
Rs. 848,753
Verified Dealer
98
SE
IWC Portuguese Chronograph Steel 41mm Black Arabic numerals
IWC Portuguese - Chronograph - Box And Papers - 2 Years Warranty
Rs. 344,408
Verified Dealer
628
MC
IWC Portuguese Chronograph 41mm Silver
IWC ポルトギーゼクロノ
Rs. 417,916
Free shipping
Verified Dealer
 
JP
IWC Portuguese Hand-Wound Steel 44mm Black Arabic numerals
IWC Portuguese Hand-Wound Stainless Steel IW545404 - W6054
Rs. 473,289
Verified Dealer
273
UK
IWC Portuguese Automatic Steel 42.3mm Silver Arabic numerals
IWC Portuguese Automatic 500705 - Silver White Dial - 5007
Rs. 722,460
Verified Dealer
246
US
IWC Portuguese Chronograph Steel 41mm Silver Arabic numerals
IWC Schaffhausen Portugieser 3714 Bucherer Limited Edition 365p
Price on request
Verified Dealer
40
LU
IWC Portuguese Automatic Steel 40mm Blue
IWC Portugesier 7-Days Ref. IW500710
Rs. 788,936
Verified Dealer
369
NL
IWC Portuguese Automatic 35mm Champagne
IWC 18kt Gold Portugieser Automatik von 2002, Service 2019,...
Rs. 463,750
Free shipping
Verified Dealer
30
DE
IWC Portuguese (submodel) Steel 43mm Silver Arabic numerals
IWC Portugieser Regulateur
Rs. 600,712
Verified Dealer
1200
NL
IWC Portuguese Chronograph Steel 41mm Silver
IWC ポルトギーゼ クロノグラフ IW371445
Rs. 368,951
Free shipping
Verified Dealer
247
JP
IWC Portuguese Chronograph Rose gold 41mm Silver Arabic numerals
IWC Portuguese Collection Chronograph 18k Rose Gold 41mm...
Rs. 1,014,711
Verified Dealer
307
US
IWC Portuguese Automatic Steel 42.3mm Silver No numerals
IWC IW500107 Portuguese 7 Day - Complete Set Box & Papers
Rs. 587,173
Free shipping
Verified Dealer
109
UK
IWC Portuguese (submodel) White gold 43mm Grey Arabic numerals
IWC Regulateur White Gold IW544404 - W5128
Rs. 1,228,876
Verified Dealer
273
UK
IWC Portuguese Perpetual Calendar White gold 44.2mm Black Arabic numerals
IWC Portugieser Perpetual Calendar "m"
Rs. 1,696,412
Verified Dealer
42
DE
IWC Portuguese Chronograph Steel 40.9mm Blue Arabic numerals
IWC Portuguese Chronograph - Blue Dial - 371491 - 2019
Rs. 446,545
Verified Dealer
246
US
IWC Portuguese Chronograph Steel 40.9mm White
IWC Portugieser Chronograph Ref. IW371446
Rs. 456,541
Verified Dealer
369
NL
IWC Portuguese Grande Complication Rose gold 45mm Silver
IWC Portuguese Grande Complication
Rs. 8,350,035
Verified Dealer
29
US
IWC Portuguese Automatic Steel 42.3mm Black Arabic numerals
IWC Portugieser 7-Days
Rs. 556,660
Verified Dealer
1200
NL
IWC Portuguese Yacht Club Chronograph Steel 43.5mm
IWC ポルトギーゼ ヨットクラブ クロノグラフ IW390507
Rs. 603,737
Free shipping
Verified Dealer
247
JP
IWC Portuguese Chronograph Steel Black Arabic numerals
IWC Portuguese Chronograph
Rs. 362,319
Verified Dealer
 
US
IWC Portuguese Chronograph Steel 41mm Silver Arabic numerals
IWC Portugieser Chronograph IW371401 / 2006 / B+P
Rs. 335,998
Verified Dealer
66
NL
IWC Portuguese Perpetual Calendar Rose gold 42mm Silver Arabic numerals
IWC Portuguese Perpetual Calendar Silver Dial on Strap IW502213
Rs. 1,241,251
Verified Dealer
143
US
IWC Portuguese Yacht Club Chronograph Steel 45.5mm Black Arabic numerals
IWC Portuguese Yacht Club Chronograph IW3902-10
Rs. 453,806
Free shipping
Verified Dealer
622
US
IWC Portuguese Chronograph Steel 40mm Silver Arabic numerals
IWC Portuguese Chronograph 41MM GoldHands BoxPapers 2008
Rs. 344,408
Verified Dealer
283
BE
IWC Portuguese Chronograph Steel 40.9mm Black
IWC Portuguese Automatic Chronograph
Rs. 456,083
Verified Dealer
137
UK
IWC Portuguese Hand-Wound Platinum
TOP
IWC Portuguese Jubilee 125th Anniversary - 5441 - in Platin
Rs. 1,823,158
Private Seller
 
CH
IWC Portuguese Chronograph Steel 40.9mm Black Arabic numerals
IWC Portugieser Chronograph Rattrapante Edition Boutique Genève
Rs. 695,224
Verified Dealer
1200
NL
IWC Portuguese Hand-Wound Rose gold 44mm Silver
IWC ポルトギーゼ ヴィンテージ 1939 IW544503
Rs. 804,983
Free shipping
Verified Dealer
247
JP
IWC Portuguese Chronograph Steel 41mm Silver Arabic numerals
IWC Portuguese Collection Split Second Rattrapante Chronograph...
Rs. 484,665
Verified Dealer
307
US
IWC Portuguese (submodel) Rose gold 43,1mm Arabic numerals
IWC PORTOGHESE REGOLATORE Rose Gold IW544402 -NOS
Rs. 905,073
Free shipping
Verified Dealer
89
IT
IWC Portuguese Hand-Wound Steel 44mm Black Arabic numerals
IWC Portuguese Hand-Wound "p"
Rs. 568,674
Verified Dealer
42
DE
IWC Portuguese Chronograph Steel 40.9mm Silver Arabic numerals
IWC Portugieser Chronograph IW3714-45
Rs. 395,719
Free shipping
Verified Dealer
622
US
IWC Portuguese Chronograph Steel 40.9mm Silver
IWC Portuguese Stainless Steel Silver Automatic IW371446
Rs. 430,424
Verified Dealer
203
HK
IWC Portuguese Chronograph Steel 41mm Silver
IWC Portugieser 3712 Chronograph Rattrapante 41mm B+P 2003 D
Rs. 504,598
Verified Dealer
71
DE
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The IWC Portugieser: Classic Swiss Luxury Watches

The Portugieser is one of the most popular and successful collections from IWC, especially the elegant chronograph models. One highlight is the Grande Complication with a perpetual calendar, chronograph function, and minute repeater.

5 Reasons to Buy an IWC Portugieser

  • Recognizable design based on classic marine chronometers
  • Complications: Chronograph, annual calendar, perpetual calendar
  • Portugieser Chronograph Classic with a flyback function
  • Automatic model with an in-house caliber and 7-day power reserve
  • Sidérale Scafusia with a constant-force tourbillon, perpetual calendar, and star chart

From Chronographs to Grand Complications

The Portugieser is one of the most popular and highly coveted watches to ever come from IWC Schaffhausen. It gets its name from the Portuguese businessmen who commissioned IWC to make wristwatches with the accuracy of marine chronometers in the 1930s. Today's collection ranges from classically elegant chronographs and automatic watches with a 168-hour power reserve to especially complicated timepieces with a perpetual calendar, minute repeater, and stopwatch function.

The Portugieser Sidérale Scafusia is IWC's pièce de résistance. This platinum tourbillon watch boasts a perpetual calendar, sidereal time, and star chart. Furthermore, this complicated wristwatch features a constant-force mechanism that guarantees optimal accuracy. IWC only produces a few copies of this extraordinary luxury watch each year.

The Portugieser Chronograph is much more prevalent than the Sidérale Scafusia. This classic chronograph is among the collection's most famous and affordable models. The caliber IWC 79350, based on the ETA Valjoux 7750, powers more recent editions. IWC's watchmakers heavily modify this movement to bring it up to company standards. The case is almost 41 mm in diameter and is available in stainless steel or gold.

Prices for the IWC Portugieser: An Overview

Model/Reference Price (approx.) Material/Diameter
Grande Complication, IW377601 205,000 USD Platinum, 45 mm
Perpetual Calendar, IW503406 46,000 USD Platinum, 44.2 mm
Annual Calendar, IW503504 25,500 USD Rose gold, 44.2 mm
Chronograph Classic, IW390402 19,000 USD Rose gold, 42 mm
Yacht Club Chronograph, IW390211 11,000 USD Stainless steel, 43.5 mm
Automatic, IW500109 9,700 USD Stainless steel, 42.3 mm
Chronograph, IW371445 6,300 USD Stainless steel, 40.9 mm

How much does the IWC Portugieser cost?

Most people immediately associate the Portugieser with the Portugieser Chronograph. A round case, Arabic numerals, narrow feuille (leaf-shaped) hands, a small seconds at 6 o'clock, and a minute counter at 12 o'clock define this timepiece. IWC decided to forgo an hour counter and date display for this model in the name of greater readability. The caliber 79350, based on the ETA Valjoux 7750, provides this timepiece with its 44-hour power reserve and automatic winding. The Portugieser Chronograph comes in stainless steel or rose, white, or yellow gold and is 40.9 mm in diameter. At 12 mm thick, this wristwatch is relatively flat for a chronograph.

If you're interested in the stainless steel edition, be sure to have around 6,300 USD on hand for a mint-condition model. Pre-owned pieces often sell for under 5,600 USD. In terms of dial color, you can choose from silver, blue, or black. The rose gold version has a silver or slate-colored dial. IWC refers to their slate dials as "Ardoise." These timepieces sell for about 13,000 USD new and under 11,500 USD pre-owned.

The IWC Portugieser Rattrapante is one of the top Portugieser Chronograph models. Thanks to its split-seconds mechanism, this wristwatch can even time intervals. This is made possible by a third push-piece at 10 o'clock. IWC first introduced the Portugieser Chronograph Rattrapante in 1995 and has been regularly releasing limited editions ever since. One such timepiece is the "Boutique Milano," which is limited to 100 copies. This rose gold watch bears the reference number IW371215 and has a blue dial. It's worn on a beautiful black alligator leather strap. The case back features an engraving of the biscione, the serpentine emblem of Milan's Visconti family. Inside, you'll find the manual caliber 76240 with a 44-hour power reserve. This movement is based on the Valjoux 7760. Never-worn models cost around 14,000 USD at IWC's boutique locations.

Features of the IWC Portugieser Chronograph

  • Elegant dress watches with a stopwatch function
  • A tidy dial with a small seconds dial and minute counter
  • The caliber 79350 based on the Valjoux 7750
  • Top models with a double (rattrapante) chronograph

Portugieser Chronograph Classic & In-House Caliber 89361

Looking for a Portugieser Chronograph with an in-house caliber? Then you should check out the Classic series. These wristwatches use the caliber 89361 with a flyback function and 68-hour power reserve. A sapphire glass case back offers a view of this intricately finished movement at work, including its Geneva stripes and skeletonized rotor.

The Portugieser Chronograph Classic features a dual 12-hour and 60-minute counter at 12 o'clock, as well as a date display at 3 o'clock. A railroad minute scale lends this watch a more classic feel. You can choose between a silver or blue dial and a stainless steel or rose gold case. Both versions are 42 mm in diameter, 14.2 mm thick, and water resistant to 30 m (3 bar, 98 ft). A black or brown alligator leather strap completes the final look of this luxury watch and underscores its timeless elegance.

A stainless steel IWC Portugieser Chronograph Classic costs around 9,900 USD new and 8,300 USD pre-owned. Mint-condition rose gold models demand about 17,000 USD, while used watches change hands for some 16,500 USD.

Portugieser Yacht Club Chronograph: Water-Resistant to 60 m

The Portugieser Yacht Club Chronograph is the sporty member of the Portugieser family. A 43.5-mm stainless steel or rose gold case, a rubber strap, and an improved water resistance of 60 m (6 bar, 197 ft) characterize this model. The crown protector and red stopwatch seconds hand highlight this watch's sporty character. On the other hand, the railroad minute scale around the dial's edge and the design of the subdials add a more classic touch.

As seen in the Portugieser Chronograph Classic, the in-house caliber 89361 with a flyback function and a 68-hour power reserve provides this watch with its accurate timekeeping and chronograph function. You can see this movement through a sapphire glass case back.

Plan to spend around 11,000 USD on a never-worn stainless steel model. Pre-owned pieces sell for about 7,900 USD. Be sure to set aside at least 18,500 USD for a mint-condition timepiece in rose gold and around 15,500 USD for a pre-owned example.

Features of the Portugieser Yacht Club Chronograph

  • The Portugieser sports watch
  • In-house caliber 89361 with a flyback function and 68-hour power reserve
  • Rubber strap
  • Water-resistant to 60 m (6 bar, 197 ft)

Portugieser Automatic with a 7-Day Power Reserve

The Portugieser Automatic is the ideal wristwatch for anyone who can do without a chronograph function. This luxury watch's design resembles that of marine chronometers, thus placing it firmly in the Portugieser collection. At first glance, you could easily mistake it for a chronograph model due to its small seconds dial at 9 and power reserve indicator at 3 o'clock. However, upon closer inspection, you'll notice a lack of chronograph push-pieces and no minute or hour counters. Instead, this automatic watch has a date display at 6 o'clock.

The in-house caliber 52010 is visible through a sapphire glass case back and gives the Portugieser Automatic its impressive 168-hour power reserve. This means you can set this watch aside for days at a time without having to worry about it stopping.

The Portugieser Automatic is 42.3 mm in diameter, 14.2 mm thick, and water resistant to 30 m (3 bar, 98 ft). It comes in stainless steel or rose gold with a silver, blue, black, or Ardoise dial.

A new Portugieser Automatic in stainless steel sells for around 9,700 USD, while pre-owned pieces change hands for about 7,300 USD. Expect to pay anywhere from 13,000 to 17,500 USD for a rose gold model.

How much does the Portugieser Hand-Wound cost?

The IWC Portugieser Hand-Wound has a long history to look back on. Manual pocket watch movements tick away inside the original models from the 1930s. In 1993, IWC celebrated their 125th anniversary by releasing a new edition with the manual caliber 9828. The design of this anniversary watch is very simple and heavily influenced by early models from the 30s. It bears the reference number 5441 and is available in stainless steel, rose gold, or platinum. There are 1,000 copies in stainless steel, 500 in rose gold, and only 250 in platinum.

Depending on its condition, prices for a stainless steel model range from 8,900 to 13,500 USD. The gold edition costs around 17,000 USD, and the platinum edition is priced around 28,000 USD. You can purchase the full set for some 45,000 USD.

IWC released another anniversary edition 25 years later: the Portugieser Hand-Wound Eight Days Edition "150 Years." This model is limited to a run of 1,000 pieces in stainless steel and 250 pieces in rose gold. Its small seconds dial at 6 o'clock and railroad minute scale conjure images of watches from the 1930s. The in-house caliber 59215 with an eight-day power reserve ticks away inside each timepiece. IWC put its power reserve indicator on the underside of the movement to maintain the harmony of the dial displays. You can view the indicator and the rest of the refined movement through a sapphire glass case back.

The stainless steel version demands around 9,800 USD new and 8,300 USD pre-owned. The rose gold edition is much more expensive at 37,000 USD in mint condition and 26,000 USD pre-owned.

Prices for Portugieser Models with a Perpetual Calendar

If you prefer watches with a calendar function, the IWC Portugieser collection has some good options. The perpetual calendar is among the most complex complications and represents the pinnacle of watchmaking craftsmanship – especially when it's been developed in-house. The IWC Portugieser Perpetual Calendar has been powered by such movements since 2015, namely the calibers 52610 and 52615. While the 52615 features a double moon phase display that takes the northern and southern hemispheres into account, the 52610 has a single moon phase display. Regardless of which you choose, both displays will only deviate by one day in 577.5 years. What's more, this luxury watch shows the date, day, month, and year. It also comes with a power reserve indicator that lets you know how much of the seven-day power reserve remains in its twin barrels.

The 44-mm Portugieser Perpetual Calendar is available in platinum or 18-karat rose or white gold. Like many other Portugieser models, you can choose from a silver, Ardoise, or blue dial. High-quality alligator leather straps from Santoni, a luxury Italian brand, hold these complicated timepieces securely on the wrist.

A new platinum edition with a silver dial requires an investment of around 46,000 USD. At about 32,500 USD, the white gold version with a blue dial is much more affordable. You'll find pre-owned gold models for about 27,500 USD. The rose gold Portugieser Perpetual Calendar with a double moon phase costs around 30,500 USD new and 27,000 USD pre-owned. Its white gold counterpart demands anywhere from 26,500 to 33,000 USD.

How much does the Portugieser Annual Calendar cost?

Watches with an annual calendar are often more affordable due to their less complicated movements. However, this does mean you'll have to manually correct your Portugieser Annual Calendar once a year at the end of February. In contrast, perpetual calendars will first require manual correction in 2100.

The design of the IWC Portugieser Annual Calendar closely resembles that of the collection's more recent Automatic models, including the power reserve indicator at 3 and small seconds dial at 9 o'clock. However, unlike the Automatic, the Portugieser Annual Calendar indicates the day and month in addition to the date. These three displays sit in a semicircle below 12 o'clock. The case of the Portugieser Annual Calendar is 44 mm in diameter, almost 15 mm thick, and comes in stainless steel or rose gold. The in-house caliber 52850 provides this timepiece with its 168-hour power reserve, automatic winding, and stop seconds mechanism.

You can purchase a never-worn stainless steel model for some 17,000 USD. Pre-owned pieces change hands for around 14,500 USD. If you're interested in the rose gold model, make sure you have at least 25,500 USD on hand for a mint-condition timepiece and about 21,500 USD for a used watch.

Portugieser Grande Complication with 20 Functions

The Portugieser Grande Complication is one of IWC Schaffhausen's most complex watches. Its 20 functions include a chronograph, perpetual calendar, moon phase display, and minute repeater. Minute repeaters relay the time acoustically using a series of chimes. Only the most skilled watch manufacturers have mastered this melodic complication.

With a diameter of 45 mm and a height of 16 mm, the Portugieser Grande Complication is rather large. It's only available in rose gold or platinum, making it much heavier than a stainless steel watch. Both versions are limited to runs of 250 pieces. An engraving on the case back tells you exactly which of these pieces you have. There, you'll also find an engraving of a compass rose that serves as a nod to this watch's historical roots. The alligator leather strap comes from Santoni and features rose gold or platinum stitching.

A never-worn IWC Portugieser Grande Complication in platinum costs over 201,000 USD. You can save some money by purchasing its sister model in 18-karat rose gold. This timepiece sells for just over 176,000 USD new. Both versions are available for under 112,000 USD pre-owned.

An Overview of the Most Important Functions

  • Perpetual calendar
  • Minute repeater
  • Chronograph
  • Moon phase display
  • Automatic
  • Stop-seconds mechanism

IWC's Masterpiece: The Portugieser Sidérale Scafusia

The Portugieser Sidérale Scafusia is IWC's most complicated wristwatch to date. It took 10 years to develop. The most important features of this timepiece are its constant-force tourbillon, four-day (96-hour) power reserve, and sidereal time display. A sidereal day is about four minutes shorter than a conventional, 24-hour day. Astronomers use sidereal time to locate the same stars in the sky night after night, for example.

Sidereal time is based on the apparent movement of the stars in the sky relative to Earth's rotation. One sidereal day is equal to the amount of time it takes the same star to return to the same position. Put another way, it's how long it takes for the Earth to complete one full rotation on its axis.

The Portugieser Sidérale Scafusia shows the sidereal time on a subdial at 12 o'clock. The central hour and minute hands and the off-center second hand display the time according to the more familiar 24-hour day. The small seconds hand is attached to the tourbillon's cage, which makes one full rotation per minute. You'll also find a power reserve indicator at 4:30; its hand shows when the manual caliber 94900 requires more energy.

The Sidérale Scafusia's Constant-Force Tourbillon

The constant-force tourbillon used in the IWC Portugieser Sidérale Scafusia is truly special. The power transfer between the mainspring and escapement system usually varies over time in mechanical movements. The spring is under the most tension when fully wound. As more energy is used, the amplitude declines, thus leading to lower accuracy. Astonishingly, IWC has managed to compensate for the balance's decreasing amplitude.

IWC's constant-force tourbillon keeps a constant balance amplitude, which leads to extremely accurate timekeeping. This constant-force mechanism can run for 48 hours uninterrupted thanks to a pair of connected barrels. After that, the watch can still tick for another 48 hours, albeit without the benefits of this refined mechanism. You can recognize when this change has taken place by the movement of the second hand and, of course, the power reserve display. After 48 hours, the balance frequency falls to 18,000 A/h, and the hand second moves in five small steps every second. When the constant-force mechanism is active, the second hand jumps forward once per second, much like a quartz timepiece. IWC also crafts a version of their Ingenieur sports watch with a constant-force tourbillon. The Big Pilot's Watch Constant-Force "Le Petit Prince" has been around since 2019.

A Star Chart on Your Wrist

A star chart is featured on the back of the Portugieser Sidérale Scafusia. This chart displays the night sky over a specific location. Every chart shows between 500 and 1,000 visible stars. Marked constellations allow for easier orientation. Thanks to a polarization filter, the chart is blue during the day and gray at night. Two 24-hour rings on the back display the time: The outer ring indicates the mean solar time, while the inner ring shows sidereal time. Moreover, this watch displays the times of sunrise and sunset in addition to its perpetual calendar function. Day 1 is January 1st, day 31 is January 31st, and December 31st is day 365 – or day 366 if it's a leap year. Many astronomers use this counting system. A small window indicates whether or not it's a leap year using the abbreviation "LY." To calculate the current date, simply add the middle number in the large window to the smaller number on the right.

The 46-mm case of the Portugieser Sidérale Scafusia is made of either platinum or 18-karat white or red gold. Its size means it's well suited for larger wrists. It may seem quite thick at 17.5 mm; however, its 520 individual movement components require extra space. With a platinum case, the watch weighs 280 g. The strap is made of alligator leather from the luxury Italian brand Santoni.

Extraordinary Precision Since the 1930s

The IWC Portugieser can trace its history back to the first half of the 20th century. In the late 1930s, two Portuguese businessmen commissioned the International Watch Company (better known as "IWC") to make wristwatches with the accuracy of marine chronometers. Marine chronometers are highly precise clocks used by seafarers for navigation. Back then, only pocket watch movements could achieve the same accuracy. That is why IWC took the Savonnette pocket watch caliber 74 and housed it in a wristwatch case. This movement has its crown on the right-hand side, making it an obvious choice.

Since the caliber 74 was intended for pocket watches, the wristwatch version was exceptionally large. Its 41.5-mm case was much larger than that of popular Art-Deco-style watches at the time. In terms of design, the Portugieser was well ahead of its time. It also came with some technological benefits: Its larger pocket watch balance meant the first Portugieser was much more accurate than other contemporary watches with smaller dimensions.

IWC only produced a few hundred copies of this "pocket watch for the wrist" before the 1990s. In 1993, the Swiss manufacturer redesigned the Portugieser. It would go on to become one of their most successful collections.