Strap for Portofino Automatic Stainless Steel / White / Strap

The Portofino IW3513-20 features an 18-millimetre lug width. This measurement is taken with a digital calliper between the two attachment points of the lug bars, with tolerance ±0.1 mm. IWC attachments are parallel and free from bevels, ensuring perfect fit for straps constructed to sartorial precision.

For the Portofino IW3513-20, we recommend alligator leather in vegetable tanning: uniform grain reflects the watch's constructive rigour and develops authentic patina over time. Alternatively, vegetable-tanned calf offers chromatic versatility and soft patina. For sportive use, FKM rubber with hammered texture maintains formal character without transforming it into a dive watch.

The Portofino IW3513-20 utilises standard lug bars with removable pins. Extract the pins using a dedicated pin-removal tool (or have a watchmaker do so), insert the new strap's pins into the parallel attachments, and secure the pins. Verify that the strap has no excessive play before wearing the watch.

Yes, any strap with 18-millimetre lug width is compatible with the Portofino IW3513-20. Artisanal milanostraps.it straps are constructed with precise tolerance ±0.1 mm on the attachment points, guaranteeing perfect fit to the case geometry without anomalous play.

A leather strap in vegetable tanning, worn at moderate frequency (3–4 days per week), maintains structural and aesthetic integrity for 3–5 years. Visible wear (patina, creasing) is natural and desirable. Vegetable tanning ages better than synthetic tanning. Casati Milano warranty: 18 months on custom straps.