Strap for Portofino Complete Calendar 41 Stainless Steel / Silver

The lug width (misura ansa in Italian) of the IWC Portofino IW3590-01 is 20 millimetres. This measurement is determined by positioning a ruler perpendicular to the strap plane and measuring from lug to lug at the case attachment points. A 20mm lug width requires straps specifically dimensioned to this specification: universal "one-size-fits-all" straps rarely guarantee a correct fit on this width.

An alligator strap in black represents the most stylistically coherent choice for the Portofino IW3590-01, given the case's formal vocation. Nile crocodile alligator with matte finish creates a surface that captures light without dispersion, amplifying the sensation of understated elegance. Alternatively, vegetable-tanned calf leather in dark brown or grey-sand alligator that develops natural patina maintain the aesthetic balance of the case.

Changing the strap on the Portofino IW3590-01 requires the use of specific tools: a spring bar removal tool, or a small pin and precision hammer. Position the watch on a soft surface, identify the spring bars on both sides of the case, apply controlled pressure towards the centre of the case to release the old strap, then insert the new strap ensuring that the bars engage perfectly in both attachments. If you are not experienced, we recommend contacting an authorised service centre.

Yes, any strap with a 20-millimetre lug width is compatible with the Portofino IW3590-01. MilanoStraps offers a wide selection of artisanal 20mm straps in alligator, calf, shell cordovan and technical rubber, all customisable in length, colour, initials and stitching type. Each strap carries a mechanical compatibility certificate and 18-month warranty.

A high-quality natural leather strap (alligator, vegetable-tanned calf, shell cordovan) maintains full functionality for 3–5 years of regular daily use, provided it is subjected to basic maintenance: protection from direct moisture, avoidance of prolonged rain, natural air-drying after potential wetting. Patina and signs of wear accumulate progressively, adding character to the strap. Straps made from solid-dyed leather with hand-stitched seams last significantly longer than lacquered straps. After 4–5 years, a strap may require preventive replacement to keep the Portofino in optimal condition.