Portofino Midsize Stainless Steel / Blue

In Context

At 34 mm it is classically proportioned: the size a dress watch was understood to be for most of the twentieth century, and small enough to sit under a cuff. At 8.2 mm thick it is about average for a modern wristwatch. The case back is closed, so the movement stays out of sight, 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. 42 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.

IW3564-05 is one of 5 executions of the IW3564 base reference. Underneath they are the same watch; what separates this one is a blue dial and a stainless steel case. Introduced in 2007.

The 30110 is IWC's version of the ETA 2892-A2, adjusted and finished to IWC's specification and the base of the Mark XVI and Mark XVII. It powers 82 watches in this library. The 2892 is the industry's thin automatic, a millimetre slimmer than the 2824 and the base most Swiss maisons choose for a three-hand watch, and the [2892 piece](/blog/the-eta-2892) explains why. IWC's version runs at 28,800 vph with a 42-hour reserve and 21 jewels, at 25.6 mm across, and carries the date. When ETA restricted supply to outside brands, IWC moved the same specification to the Sellita SW300 as the [35111](/calibers/iwc-35111). In the library it sits under 37 [Portofino](/brands/iwc/portofino) Automatics, 23 [Pilot's Watches](/brands/iwc/pilot), the Mark XVI and Mark XVII and the Le Petit Prince edition of the latter, 16 GST Aquatimers and 6 [Ingenieurs](/brands/iwc/ingenieur). Cases run from 34 mm to 46 mm, with 38 mm the most common at 27 references and 39 mm at 14. Six are limited editions. The [32111](/calibers/iwc-32111) is the in-house five-day movement that replaced both the 30110 and the 35111 in the Mark XX and the Portofino.

81 other watches in the library run the IWC 30110.

IWC

Ingenieur Automatic Silver / Rose

IW3239-06 · 40 mm

IWC

Aquatimer Automatic Stainless Steel / Jacky Chan

IW354808 · 42 mm

IWC

Pilot's Watch Mark XVIII Military Edition Bats Legacy

IW327024 · 40 mm

IWC

Aquatimer Automatic Stainless Steel / Black / Bracelet

IW3545-05 · 42 mm