



Portofino Automatic Stainless Steel / Black - Pilot / Bracelet
REF. IW3513-15
4/10
UncommonCase
Dial
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 8.1 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.
IW3513-15 is one of 35 executions of the IW3513 base reference. Underneath they are the same watch; what separates this one is a black dial and a stainless steel case.
The IW3513 family
IW3513-15 is one of 35 variants sharing the IW3513 base reference — same watch underneath, different dial, bezel, or bracelet execution. Browse the others:

IWC
White · Yellow Gold
IW3513-01 · 34 mm

IWC
Champagne · Yellow Gold
IW3513-02 · 34 mm

IWC
Black · Yellow Gold
IW3513-03 · 34 mm

IWC
Black · Yellow Gold
IW3513-04 · 34 mm

IWC
Silver · Yellow Gold
IW3513-05 · 34 mm

IWC
Champagne · Yellow Gold
IW3513-07 · 34 mm

IWC
Black · Yellow Gold
IW3513-08 · 34 mm

IWC
Black · Yellow Gold
IW3513-09 · 34 mm
+ 26 more variants in this family.
Inside: Caliber 37521
Explore this caliber →An ETA 2892-A2 finished and regulated by IWC. The 2892 is the industry's reference thin automatic — slimmer than a 2824 and smoother to run — which is why it sits under so many Swiss brands' three-hand watches. IWC's version differs from the 37524 only in the height at which the hands are mounted, a case-fitting matter rather than a mechanical one.
35 other watches in the library run the IWC 37521.
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