IWC Portugieser Portugieser Constant-Force Tourbillon Double Moon Platinum / Silver

Reference IW5901-05

IWC Portugieser Constant-Force Tourbillon Double Moon Platinum / Silver

About this watch

The IWC IW5901-05 Portugieser Constant-Force Tourbillon Double Moon Platinum / Silver is a masterpiece of horology, blending art and science in a stunning limited edition timepiece. At its core is the IWC caliber 94800, a hand-wound movement with a patented constant force mechanism that ensures perfect balance. This tourbillon escapement counteracts gravity's effects on accuracy, making it a marvel of precision engineering. The platinum case and sunburst silver finish exude luxury, while the sapphire glass and open back design showcase the craftsmanship that went into creating this masterpiece. With a power reserve of 96 hours and water resistance of 30 meters, this watch is both functional and durable. Its double moonphase display serves as a decorative element and functional tool for astronomy enthusiasts and stargazers alike. As a limited edition with only 5 units produced, the IW5901-05 is a true collector's item that embodies artistry and engineering excellence.

Buy Now on Jomashop

This is an affiliate link

Key Features

IWC Caliber 94800 Hand-Wound Movement
Patented Constant Force Mechanism
Tourbillon Escapement
Double Moonphase Display
96-Hour Power Reserve
30-Meter Water Resistance
Platinum Case with Sunburst Silver Finish

Specifications

Brand

IWC

Family

Portugieser

Model

Portugieser Constant-Force Tourbillon Double Moon Platinum / Silver

Reference

IW5901-05

Movement

94800

Movement Features

Minutes, Hours, Small Seconds
Moonphase
Constant Force Mechanism, Tourbillon Escapement, Power Reserve Indicator

Case

46mm

Dial Color

Silver

Crystal

Sapphire

Water Resistance

Current Listings

FURTHER REDUCED IWC Portugieser Jubilee Ref. 5441 – 18k Rose Gold – Limited Edition 006/500

IWC - 5441 · $12,899

This IWC Portugieser Jubilee Ref. 5441 is a limited edition of 500 pieces produced in rose gold to celebrate the 125th anniversary of International Watch Company. It features a classic design language inspired by the original 1930s models, including a silver dial and manual-winding IWC Caliber 9828 movement.

Condition: Overall very good vintage condition, minor scuffing around the ~10 o'clock area on the crystal
Case Size: ~42 mm
Diameter: ~42 mm
Movement: IWC Caliber 9828, manual wind

Posted at

Apr 28, 2026, 9:28 PM

Active

View listing on r/WatchExchange

2020 IWC Portugieser Yacht Club "Orlebar Brown" - IW390704 - Full Set Priced to Fly

IWC - IW390704 · $7,500

A beautiful summer timepiece by IWC, the Portugieser Yacht Club Chronograph Edition 'Orlebar Brown' has a fresh and crisp aesthetic while maintaining its classic iconic design.

Condition: great preowned condition with minor signs of wear throughout the case, caseback, case sides, bracelet, and clasp
Year: 2020
Case size: 44mm
Crystal type: sapphire

Posted at

Apr 27, 2026, 7:20 PM

Active

View listing on r/WatchExchange

IWC Portugieser Chronograph IW371624 Dune Dial Full Set

IWC - IW371624 · $7,497

This pre-owned IWC Portugieser Chronograph features a stainless steel case with a dune dial and black alligator strap. The watch comes in a full set, including box, papers, and original contents.

Condition: Very good
Case size: 41 mm
Case material: Stainless steel

Posted at

Apr 27, 2026, 9:52 AM

Active

View listing on r/WatchExchange

IWC Portugieser Regulateur. IW544401. Box, Papers...

IWC - IW544401 · $6,600

IWC Portugieser Regulateur for sale, complete with box and papers.

Box: true
Papers: true

Posted at

Apr 25, 2026, 11:42 AM

Active

View listing on r/WatchExchange

[US] IWC Portugieser Automatic 40 - Silver Dial - 40mm - IW358312 - BRAND NEW

IWC - IW358312 · $7,000

This IWC Portugieser Automatic 40 is a brand new timepiece with a silver dial and 40mm case. It features an automatic movement and comes with various accessories such as a box, manual, warranty booklet, microfiber cloth, link tools, and digital transferable warranty.

Condition: Brand new, unworn
Case size: 40mm diameter

Posted at

Apr 25, 2026, 9:21 AM

Active

View listing on r/WatchExchange

IWC Portugieser Chronograph IW371624 Dune Dial Full Set

IWC - IW371624 · $7,497

A pre-owned Portugieser Chronograph with a dune dial, featuring an automatic movement and a stainless steel case.

Condition: Very good
Case size: 41mm
Case material: Stainless steel
Movement type: Automatic

Posted at

Apr 20, 2026, 9:05 AM

Active

View listing on r/WatchExchange

IWC Portugieser Tourbillon Mystere, White Gold IW504207 ♦️Lightly Used Undated♦️

IWC - IW504207 · $30,457

This listing is for an IWC Portugieser Tourbillon Mystere in White Gold, featuring a tourbillon mechanism. The watch has been lightly used and comes with the full set of box and papers.

Condition: Lightly Used
Material: White Gold
Comes With: Full set (box & papers)

Posted at

Apr 20, 2026, 5:38 AM

Active

View listing on r/WatchExchange

IWC Schaffhausen Portugieser. Blue Hands/Indices. 40mm. IW358312. Card Included..

IWC Schaffhausen - IW358312 · $4,950

This IWC Portugieser is a gorgeous watch with an inhouse movement, available for sale. It features blue hands and indices on a 40mm case.

Case size: 40mm diameter
Movement type: inhouse

Posted at

Apr 19, 2026, 11:42 AM

Active

View listing on r/WatchExchange

IWC Portugieser Jubilee Ref. 5441 – 18k Rose Gold – Limited Edition 006/500 – REDUCED PRICE

IWC - 5441 · $13,249

A limited edition IWC Portugieser Jubilee Ref. 5441 in 18k rose gold produced to celebrate IWC's 125th anniversary, featuring a manual-winding movement and classic Portugieser design language.

Condition: Overall very good vintage condition, minor scuffing around the ~10 o'clock area on the crystal.
Case Size: ~42 mm
Dial Color: Silver
Movement Type: Manual winding

Posted at

Apr 18, 2026, 2:43 PM

Active

View listing on r/WatchExchange