Strap for Portofino 34 Stainless Steel / Peach Powder

The lug width of the Portofino IW3574-17 is 16 millimetres. This non-standard measurement reflects the classical proportion calculated for a 34 millimetre case. Before purchasing an aftermarket strap, we recommend verifying the measurement with a digital calliper, measuring the internal distance between the two lugs of the case.

Alligator remains the choice most coherent with the formal profile of the Portofino, particularly in châtaigne, dark brown or black laqué tones. Shell cordovan represents an excellent alternative for those seeking a leather that develops patina over time. A vegetable-tanned calf offers daily versatility without aesthetic compromise. For sporting use, a ceratted canvas NATO with stainless steel deployante buckle permits transitions between different contexts.

Strap changing occurs via the spring bars (spring-tensioned pins) that secure the strap to the case lugs. Use a spring bar remover tool (small double-ended lever) to compress the internal spring and release the pin from one side. Remove the used strap, insert the pin through the hole of the new strap's lug, and release. Repeat on the opposite side. If inexperienced, the Casati Milano atelier and many jewellers offer this service.

Yes, provided the lug width is precisely 16 millimetres and the spring bars are of correct length (typically 14 millimetres for this case). 16mm straps produced by specialised brands such as Milano Straps, Hirsch, Barenia or Panerai-compatible are fully functional. Caution: straps labelled 16mm but manufactured with loose industrial tolerances may exhibit undesired play.

Durability depends on material and usage. An alligator or shell cordovan, worn daily, resists 5–8 years before requiring replacement due to buckle wear or structural failure. A vegetable-tanned calf typically offers similar durability, 4–6 years, with visible patina development. Factors such as humidity, solar exposure and frequency of wear directly influence longevity. The Casati Milano atelier provides an 18-month structural guarantee on bespoke straps.