Strap for Portofino Automatic / Stainless Steel / Blue / Strap

The lug width of the IWC Portofino IW3533-24 is 20 millimetres. This measurement is specific to this reference and ensures correct aesthetic proportion between case and strap. Measuring the lug width is straightforward: use a digital calliper between the internal case lugs, at the lug-to-lug line. IWC manufacturing tolerance allows minimal variations around this dimension.

Crocodile leather represents the most coherent choice for the formal character of the Portofino IW3533-24: the natural, structured grain complements the case without competing visually. English calf offers everyday versatility and superior durability, maintaining shape and elasticity for 3-4 years of use. Shell cordovan is a rare, dense option ideal for those accepting careful maintenance. Rubber vulcanised straps resolve technical usage requirements without compromising design integrity.

Strap replacement requires minimal tools: a spring bar tool and a clean work surface. Position the watch with the lugs facing upward. Insert the flat tip of the spring bar tool gently at the spring mechanism, applying lateral pressure to release the bar. Repeat on the opposite lug. Place the new strap on the lugs, reinsert the springs ensuring they seat properly. Verify attachment by gently pulling the strap.

Yes, there is considerable availability of 20-millimetre aftermarket straps. Specialist manufacturers offer solutions in crocodile, calf leather, shell cordovan, and technical materials, guaranteeing mechanical compatibility with original IWC lugs. Atelier Casati Milano produces bespoke handcrafted straps, with personal leather selection, customisation in length and initials, and 18-month warranty.

Durability depends on construction quality and material choice. An artisanal-grade chrome-tanned calf strap lasts 3-4 years with moderate daily use. Crocodile leather offers comparable durability, developing unique patina after 18-24 months. Shell cordovan, if maintained regularly, exceeds 5 years. The finish of the strap ends and quality of stitching determine replacement timing: choose straps constructed with tight stitching and quality waxed cotton thread.