Strap for Portofino Lady Chronograph MecaQuartz Stainless Steel / Yellow Gold / White / Alligator

The lug width of the IWC Portofino IW3730-18 is 16mm. This specific measurement is a design characteristic of the model, consistent with the compact 29mm case. Correct measurement is performed by placing a calliper between the two attachment pins, perpendicular to the case, avoiding the internal spring.

The best strap depends on intended use: alligator leather with vegetable tanning emphasises the dress watch character; box calf with pronounced grain adds patina and presence; shell cordovan offers elegant rigidity; canvas NATO is ideal for summer. Your choice should reflect the intended context and personal aesthetics.

Use a spring bar tool to remove the attachment pins from the case. Position the tool in the small slot on the lug sides, gently compress the spring, extract the pin and remove the strap. Repeat on the opposite side and install the new strap by inserting the pin into the corresponding holes.

Yes, provided the aftermarket strap is manufactured to millimetre precision for 16mm. Relying on specialised manufacturers is essential: a 0.5mm tolerance renders the strap unusable. Custom straps from Casati Milano offer this precision with personal leather selection and direct communication.

Durability depends on leather quality and usage. Premium alligator or calf leather with vegetable tanning lasts 3–5 years of moderate daily wear. Shell cordovan is more resilient, lasting 7–8 years. Regular maintenance with specialised wax and limited water exposure significantly extend strap lifespan.