Strap for Portofino Chronograph MecaQuartz Yellow Gold / White / Alligator

The IWC Portofino IW3731-01 features a lug width of 18mm. You can verify this by measuring the internal space between the case lugs using a digital calliper. IWC selected this width to maintain optimal proportions between the case diameter (35mm) and the strap, avoiding visual imbalance.

For the yellow gold Portofino, we recommend natural brown alligator or burgundy shell cordovan. Both materials respect the classical and bespoke vocation of the precious case. Alligator offers formal discretion, whilst shell cordovan evolves over time, creating a unique patina. Avoid black straps, as they disrupt the chromatic harmony between the gold and leather.

To change the strap, obtain a dedicated spring bar tool. Locate the attachment pins at the case extremities, insert the tool into the slot to compress the internal spring, then gently extract the pin. Repeat on the opposite side. Install the new strap by reversing the procedure, ensuring the pins are properly positioned in both case lugs.

Yes, any strap with an 18mm lug width is compatible with the IWC Portofino IW3731-01. However, to preserve the classical aesthetic identity of this model, we advise against NATO or technical rubber straps, which conflict with the formal style of the case. Choose natural leathers with artisanal finishing.

A quality leather strap (alligator, shell cordovan, vegetable-tanned calf) under moderate use lasts between 3 and 7 years. Durability depends on frequency of wear, exposure to moisture and perspiration, and maintenance practices. Our natural leather straps, guaranteed for 18 months, benefit from artisanal construction that extends service life with proper care.