Strap for Portofino Automatic 37 Stainless Steel - Diamond / Silver

The Portofino IW6586-01 in 37mm version features a lug width of precisely 18mm. This measurement is calculated on the distance between the spring bars that attach the strap to the case lugs. It is essential to verify this specification before purchasing an aftermarket strap, as an incorrect lug width would create abnormal tension and compromise the wearability and durability of the timepiece.

For this classic 37mm model we recommend: alligator in vegetable tanning (aesthetic excellence and natural patina development), vegetable-tanned dark brown calf (rich texture and formal appearance), Swiss NATO grey or beige (practicality without visual compromise). We advise against brightly coloured straps (red, electric blue), which contrast with the Portofino's understated philosophy. The choice depends on usage: formal daily wear → alligator; mixed use → calf; sports contexts → NATO or rubber.

Strap changing requires: 1) a spring bar tool (small tool with bifid extremity); 2) access to the lateral pins of the case at 3 and 9 o'clock. Position the tool in the pin slot, push downward gently until the release click, extract the pin and remove the old strap. Insert the new strap (18mm) onto the same pins, snap the pin in the opposite direction until locking. Verify that the strap is perfectly aligned before wearing the timepiece.

Yes, provided that the lug width is certified at 18mm. An artisanal strap of 18mm from any source fits perfectly into the factory lugs. We recommend purchasing from specialist suppliers who guarantee millimetre tolerance and controlled materials (alligator, calf, shell cordovan). Bespoke artisanal straps additionally offer the possibility of personalising length, colour, stitching thread and buckle type (deployant, traditional loop), creating a sartorial experience impossible with stock straps.

A quality leather strap (alligator or vegetable-tanned calf) mounted on a daily-wear Portofino lasts on average 3-5 years, depending on frequency of wear and exposure to humidity. Vegetable-tanned leather develops natural patina, enhancing aesthetic appearance within the first year. Factors that reduce durability: constant perspiration exposure, direct water washing, extreme temperatures. A vulcanised FKM rubber strap resists 5-7 years without material degradation. Casati Milano artisanal warranty covers construction defects for 18 months; wear is natural and foreseeable.