Strap for Portofino Lady Chronograph MecaQuartz Stainless Steel / Black / Calf

The IWC Portofino IW3730-05 features a lug width of 16mm. This non-standard measurement is specific to this reference and is essential for selecting compatible straps. To verify, use a digital calliper and measure the distance between the inner edges of the two holes where the strap inserts. Avoid confusing this dimension with the case diameter (29mm): these are completely independent parameters.

For the Portofino, straps in alligator leather with vegetable tanning are recommended, as they emphasise the watch's dress-oriented character, or shell cordovan for those appreciating a natural patina that evolves over time. Calf leather with a fine grain represents a versatile and practical alternative. Ideal colours are pure black for maximum contrast, or cognac brown for warmer elegance. NATO straps are discouraged on this model as they contradict the dress watch philosophy.

Strap replacement on the Portofino is performed using a spring bar tool. Place the watch on a soft surface, locate the lug holes, insert the tool's tip into a hole and apply gentle pressure to release the lug. Repeat on the other side. Once the old strap is removed, align the new one and reinsert the lugs into the case holes. For a professional procedure, our Casati Milano atelier performs assembly with meticulous care and customisation options.

Yes, any strap with a 16mm lug width is compatible. It is essential to verify that the new strap is manufactured for this specific width, as the lugs must fit correctly into the case holes. We recommend high-quality artisanal straps manufactured with vegetable tanning or cordovan to preserve the aesthetic value and longevity of the watch.

A quality artisanal strap in alligator or shell cordovan with vegetable tanning typically lasts 5-7 years with moderate daily wear. Longevity depends on climate, humidity, frequency of use and care applied. Casati Milano straps include an 18-month warranty. Proper storage away from extreme humidity and occasional cleaning with a damp cloth significantly extend the strap's useful life.