IWC Portugieser Portuguese Yacht Club Chronograph 43.5 Boesch

Reference IW3905-04

About this watch

The IWC Portuguese Yacht Club Chronograph 43.5 Boesch is a masterpiece of horology, blending stunning design with advanced technology and embodying the spirit of nautical adventure. This limited-edition timepiece, released in 2016 and limited to just 150 units, tells a story of excellence and craftsmanship. With its classic yet sporty aesthetic, it's versatile enough for both formal and casual settings. The brown color scheme paired with the stainless steel case creates a sophisticated yet sporty look. The polished finish adds a touch of elegance, making it suitable for a yacht club dinner or a casual outing. At the heart of this watch lies the IWC caliber 89361, a self-winding flyback chronograph movement boasting a 68-hour power reserve and rapid timing sequences. The sapphire crystal offers scratch-resistance and durability, while the sturdy stainless steel case protects the movement from shocks and impacts. Comfort is key, with an adjustable leather strap that complements its overall aesthetic. This watch is perfect for anyone who enjoys the finer things in life, particularly those with a passion for sailing or nautical activities.
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Key Features

  • 43.5mm Round Stainless Steel Case
  • Sapphire Crystal Scratch-Resistant and Durable
  • IWC Caliber 89361 Self-Winding Flyback Chronograph Movement
  • 68-Hour Power Reserve and Rapid Timing Sequences
  • Water Resistance up to 60 meters
  • Brown Color Scheme with Polished Finish
  • Adjustable Leather Strap

Specifications

Brand
IWC
Family
Portugieser
Model
Portuguese Yacht Club Chronograph 43.5 Boesch
Reference
IW3905-04
Movement
89361
Movement Features
  • Hours, Minutes, Small Seconds
  • Date
  • Chronograph, Flyback
Case
Stainless Steel 43.5mm
Dial Color
Brown
Crystal
Sapphire
Water Resistance
60

Current Listings

[WTS] 2023 IWC Portugieser Automatic 40 IW358312 Full Set Excellent

2023 IWC Portugieser Automatic 40 IW358312 Full Set Excellent

IWC - IW358312 · $7,250
A refined, modern interpretation of the classic Portugieser design.

  • Condition: Excellent
  • Year: 2023
Posted at
Feb 3, 2026, 1:00 PM
Active
[WTS] IWC Portugieser / Portuguese Chronograph 41mm - Extended Warranty, Box & Papers - IW371609

IWC Portugieser / Portuguese Chronograph 41mm - Extended Warranty, Box & Papers - IW371609

IWC - IW371609 · $55,000
  • Size: 41mm
  • Movement: Calibre 89365
  • Water resistance: 30m
Posted at
Feb 1, 2026, 4:07 PM
Active
[WTS] IWC Portugieser Chronograph 41mm IW371620 / Portuguese - $4950

IWC Portugieser Chronograph 41mm IW371620 / Portuguese - $4950

IWC - IW371620 · $4,950
This IWC Portugieser Chronograph features a beautifully finished white dial with blue accents and is under warranty until April 2031.

  • Condition: near mint condition with a few light marks
  • Size: 41mm diameter
  • Warranty expiry date: April 2031
Posted at
Feb 1, 2026, 2:45 PM
Active
[WTS][US] IWC Portugieser Automatic 40 - Silver Dial - 40mm - IW358312 - BRAND NEW

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

IWC - IW358312 · $7,350
This IWC Portugieser Automatic 40 - Silver Dial is a brand-new timepiece that features a 40mm diameter case and a silver dial. It comes with various accessories and includes a digital transferable warranty until 12/2025.

  • Condition: Brand new, unworn
  • Case Size: 40mm diameter
Posted at
Jan 31, 2026, 10:15 AM
Active
[WTS] IWC Schaffhausen Portugieser. Blue Hands/Indices. 40mm. IW358312

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

This IWC Portugieser is a really gorgeous watch with an in-house movement, available in a 40mm size. It has blue hands and indices.

  • Condition: Crisp
  • Case diameter: 40mm
Posted at
Jan 30, 2026, 7:02 PM
Active
[WTS] IWC Portugieser Automatic 40 – Blue Dial | Ref. IW358305 | Complete set

IWC Portugieser Automatic 40 – Blue Dial | Ref. IW358305 | Complete set

IWC - IW358305 · $4,700
A modern classic with a deep sunburst blue dial and clean design that's perfect for everyday wear, boardroom, dinner, or special events. The IWC Portugieser Automatic 40 features a well-balanced small-seconds subdial at 6:00 and uses the brand's signature Pellaton winding system with ceramic components.

  • Diameter: 40.4mm
  • Movement: IWC Caliber 82200
  • Power reserve: 60 hours
Posted at
Jan 25, 2026, 7:04 PM
Active
[WTS] IWC Portugieser Chronograph Stainless Steel Automatic 41 mm Watch IW371620

IWC Portugieser Chronograph Stainless Steel Automatic 41 mm Watch IW371620

a stainless steel Portugieser Chronograph with a 41mm case size, powered by an automatic movement.

Posted at
Jan 24, 2026, 11:11 PM
Active
[WTS][US] IWC Portugieser Automatic 40 - Silver Dial - 40mm - IW358312 - BRAND NEW

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

IWC - IW358312 · $7,400
The IWC Portugieser Automatic 40 is a high-end watch with a 40mm silver dial, featuring an automatic movement and a pristine condition.

  • Condition: Brand new, unworn, pristine condition
  • Case diameter: 40mm
Posted at
Jan 24, 2026, 9:29 AM
Active
IWC Portugieser Chronograph - 41mm - Gold Numerals - IW371604 ( new / 2024 )

IWC Portugieser Chronograph - 41mm - Gold Numerals - IW371604 ( new / 2024 )

IWC - IW371604 · $6,995
This IWC Portugieser Chronograph features a stainless steel case and gold numerals. It comes with all the original boxes, papers, booklets, and IWC Warranty Card.

  • Condition: unworn
  • Case size: 41mm diameter
  • Movement: In-House Calibre 69355
Posted at
Apr 2, 2025, 3:10 PM
Active