Strap for Portofino Automatic Moon Phase 37 Year of the Snake

The IWC Portofino IW4596-04 requires a lug width of 18 millimetres. This measurement is the fundamental parameter for selecting a compatible strap: by measuring the space between the case lugs, the strap must fit precisely to this width. A smaller measurement (16 mm) would leave lateral play; a larger one (20 mm) would not fit at all.

The ideal strap depends on intended use. For formal and business contexts, polished alligator in dark brown or black enhances the classic elegance of the model. For versatile everyday wear, vegetable-tanned calf offers the best balance between aesthetics and durability, ageing with character. Shell cordovan guarantees maximum longevity and natural patina development. Vulcanised rubber is recommended if the watch will face humid environments or dynamic activities.

The change requires a spring bar tool (a specialised implement with two flat prongs). Position the tool on the lateral holes of the pin (spring bar) that holds the strap, press inward to compress the internal spring, and slide the pin out of the case lug. The pin remains on the old strap; the new strap will accommodate the same pin. Repeat the operation symmetrically on the other side. Proceed with care to avoid scratching the case.

Yes, completely. Any strap designed for 18 mm lugs will fit the Portofino IW4596-04 thanks to international standardisation of this measurement. However, manufacturing quality varies enormously: superior leathers (genuine alligator, shell cordovan, vegetable-tanned calf) guarantee decade-long durability, whilst economy leather deteriorates within 1–2 years. Choosing a specialised manufacturer also ensures the use of spring bar pins of corresponding quality.

Durability depends on material and usage. A mid-range calf strap, worn 4–5 days weekly, resists visible wear for 3–4 years. Genuine alligator and shell cordovan extend this span to 6–8 years, developing fascinating patina. Vulcanised rubber exceeds a decade without degradation. Periodic maintenance (conditioning with neutral wax, drying after water exposure) significantly extends the useful life of any leather strap.