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

The lug width of the IWC Portofino IW3730-09 is 16mm. This dimension is specific to the model and derives from the proportional balance between the 29mm case and the overall structure. To verify the exact measurement, use a digital calliper positioned between the points where the lugs connect to the case body.

Alligator in cognac or black tones represents the classic choice, as the natural grain and progressive patina of vegetable-tanned leather pair perfectly with yellow gold. For those preferring durability and aesthetic refinement, shell cordovan in burgundy offers visual nobility and temporal resilience. Vegetable-tanned calf leather ensures comfort and tactile softness ideal for daily wear.

The strap is replaced using the spring bars located on the sides of the case. Use a dedicated watch tool (spring bar tool) or consult a professional watchmaker. Ensure the new strap has a lug width compatible with the 16mm of the Portofino. Spring bars must be inserted horizontally and locked in both seats of the case.

Yes, aftermarket straps are compatible provided they have the correct 16mm lug width. Milano Straps offers a complete collection of 16mm straps, customisable in length and thread colour, crafted from noble materials such as alligator, shell cordovan and vegetable-tanned calf, all compatible with the Portofino. Always verify compatibility before purchase by consulting the model's technical documentation.

Lifespan depends on material and usage patterns. An alligator or shell cordovan strap with vegetable tanning can last 5–8 years under moderate use conditions with appropriate maintenance. Calf leather requires greater care and offers similar durability. Stress is directly proportional to strap change frequency: more frequent replacements result in reduced wear on individual straps. Milano Straps provides straps with an 18-month warranty.