Strap for Portofino 34 Stainless Steel / Comme Moi

The lug width of the IWC Portofino IW3574-10 is 16mm. This is the distance measured internally between the two lug tubes (the metal protrusions from the case). This measurement ensures correct compatibility with specific straps, avoiding adhesion issues or stress on the buckle.

The best strap depends on your intended use. For formal occasions, we recommend alligator with vegetable tanning or shell cordovan in brown or black, which amplify the model's elegant character. For daily wear, vegetable-tanned calfskin in cognac or tan offers comfort and develops natural patina over time. For summer versatility, white or cream leather on a steel deployant buckle. The Casati Milano atelier personalises the ideal choice to your specifications.

Changing the strap requires a spring bar tool (a thin-pointed instrument) to compress the springs that hold the lug tube. Insert the tip into the upper slot of the spring bar, compress the metal button and slide the lug out of the strap. Repeat for the other side. Store the old strap in a dry place. Proceed in reverse to mount the new strap. If you prefer to avoid the risk of scratches, Casati Milano offers a strap change service by appointment at the atelier.

Yes, any strap with a 16mm lug width is compatible, provided it is made by specialist craftsmen. Milanostraps offers a wide selection of 16mm straps in premium leathers (alligator, calfskin, shell cordovan) and technical materials (NATO, rubber), all suitable for the IWC case structure. Always ensure that the thickness of the passant fits correctly to the lug tube, without forcing.

A high-quality leather strap with vegetable tanning lasts on average 3-5 years with daily wear, depending on climatic conditions and maintenance. Vegetable-tanned leather develops a natural patina over time, improving aesthetically. In humid environments or with prolonged sun exposure, durability is reduced. The Casati Milano guarantee on handcrafted straps is 18 months against manufacturing defects.