Portugieser Chronograph Ceratanium

In Context

At 41 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 13.1 mm it is a tall case, and it will catch on a cuff. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. Rated to 30 m, it is protected against rain and splashes and nothing beyond that.

The movement winds itself from the motion of your wrist. 46 hours of reserve carries it overnight, but not through a weekend in a drawer. At 28,800 vph the seconds hand advances 8 times a second.

IW37160-31 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black matte dial with a ceratanium case. It was a limited edition. Introduced in 2026. Beyond the time it carries a chronograph.

The 69355 is the in-house chronograph of the Portugieser Chronograph 3716 of 2020. It is the 69000 family without a date or an hour counter, so the dial keeps the two-register layout of the 1998 original. It powers 21 watches in this library. It first appeared in the "150 Years" Portugieser Chronograph of 2018 and replaced the Valjoux-based [79350](/calibers/iwc-79350) in the standard model in 2020. A column wheel controls the chronograph, a pawl-winding system related to the Pellaton mechanism winds a 46-hour reserve at 28,800 vph, and the movement has 27 jewels at 30 mm across, with a 30-minute counter at 12 o'clock and running seconds at 6. In the library it powers 19 [Portugieser](/brands/iwc/portugieser) Chronograph references at 41 mm, in steel with silver, blue, green and dune dials and in gold, and 2 [Portofinos](/brands/iwc/portofino). 5 are limited editions. The [69385](/calibers/iwc-69385) and [69380](/calibers/iwc-69380) are the same family with a day and date in the Pilot's Chronographs, and the [89361](/calibers/iwc-89361) the larger flyback above it.

20 other watches in the library run the IWC 69355.

IWC

Portugieser Chronograph Stainless Steel / Silver - Blue

IW3716-05 · 41 mm

IWC

Portugieser Chronograph Stainless Steel / Black

IW3716-09 · 41 mm

IWC

Portugieser Chronograph "150 Years" Stainless Steel / White

IW3716-02 · 41 mm

IWC

Portugieser Chronograph "150 Years" Red Gold / White

IW3716-03 · 41 mm