Strap for Portofino Chronograph MecaQuartz Stainless Steel / Silver / Bracelet

The lug width of the IWC Portofino IW3724-03 is 20 millimetres. This measurement represents the internal distance between the two attachment points on the case where the strap is secured. The 20mm dimension is the ideal standard for the 38mm case diameter, ensuring balanced proportions and compatibility with a wide selection of quality aftermarket straps.

For the Portofino IW3724-03, alligator or cordovan straps are primarily recommended, given the formal nature of the case. Vegetable-tanned alligator develops an evolved patina over time, whilst cordovan offers inimitable texture and natural lustre. For everyday use, fine-grain Swiss calf assures comfort and elegance. For informal sporting contexts, a NATO strap in graphite or black retains the formal legibility of the watch.

Strap replacement is performed by removing the spring bars (fixing springs) from the lugs. You will use a dedicated spring bar tool to gently compress the internal spring and slide the strap free from the lug. Proceed from the same side for both removal and installation of the new strap. If you lack experience, entrust the operation to a qualified watchmaker or the Casati Milano atelier, which operates with personalised consultation.

Yes, absolutely. The Portofino with a 20mm lug width is compatible with any quality aftermarket strap constructed to that standard measurement. MilanoStraps offers artisanal straps in alligator, calf, cordovan and shell cordovan specifically manufactured for the 20mm size, available with personalisation options in length, engraved initials and choice of stitching thread.

The lifespan of a leather strap depends upon the quality of the tanning and frequency of use. A high-quality artisanal alligator or cordovan strap, subject to proper maintenance (periodic cleaning, controlled humidity exposure), can last 5-7 years with an attractive developing patina. Swiss calf resists 3-5 years under normal conditions. Vegetable tanning slows the biological ageing of leather compared to chrome tanning, guaranteeing extended longevity. The Casati Milano atelier provides an 18-month warranty on all bespoke straps.