Strap for Portofino Lady Chronograph MecaQuartz Stainless Steel / Rose Gold / White / Calf

The lug width of the Portofino IW3730-04 is precisely 16mm, measured between the two attachment pins on the case. This dimension is specific to mid-sized Portofino models and requires straps specifically engineered for this measurement, not generic approximations.

For the two-tone (rose gold and steel) Portofino, we recommend alligator in cognac tones to enhance the gold, or grained calf in dark brown or black for a restrained aesthetic. Shell cordovan is equally exceptional, developing natural patina over time, whilst structured rubber offers a contemporary approach.

Remove the old strap by pushing the lug pins from the opposite side of the case using a spring bar tool. Align the new pins with their seats on the case and push until they engage. This is a delicate procedure; if uncertain, consult a professional watchmaker or Casati Milano atelier.

Yes, provided it is engineered precisely for 16mm lug width and the pins have the correct diameter (typically 1.5mm). Not all generic 16mm straps meet IWC's constructive tolerances. We guarantee complete compatibility on every strap we recommend.

A high-quality leather strap (alligator, calf, or shell cordovan) typically lasts 2–4 years with moderate daily wear, extending to 5–6 years with occasional use. Longevity depends on humidity exposure, sunlight, and maintenance. Casati Milano provides an 18-month warranty on every bespoke strap produced.