Strap for Portofino Automatic Red Gold / Silver / Chinese New Year

The lug width (also called ansa measure) of the IWC Portofino IW3565-21 is exactly 20 millimetres. This is the distance between the case lugs where the spring bars are attached. It is critical to respect this measurement when replacing the strap, as a 18mm or 22mm lug width would not fit securely to the case.

For a red gold case, the ideal strap is alligator leather or shell cordovan with vegetable tanning. Dark brown or cognac alligator maintains formal elegance, whilst shell cordovan develops a rich patina over time. Both materials create visual harmony with red gold without weighing down the overall aesthetic. Avoid synthetic or technical fabric straps, which shift the register towards casual wear.

The IWC Portofino strap is changed by removing the spring bars from the case lugs. You will need a dedicated spring bar tool: insert it into the groove of the spring bar, push inward and withdraw it gently. Once the bar is extracted, slide off the old strap and align the new one with the case. Reinsert the spring bar ensuring it is securely locked on both sides. If you are not experienced, consult a watchmaker: it is a 5-minute operation but requires care not to scratch the case.

Yes, any strap with a 20mm lug width is compatible with the Portofino IW3565-21, provided the spring bars are removable (standard system). Quality aftermarket straps often exceed originals in hand finishing and customisation. Choose suppliers that certify compatibility and offer extended warranty. Atelier Casati Milano, for example, tests every strap before delivery.

The lifespan of a leather strap depends on the tanning process, manufacturing quality and usage. A well-tanned alligator or shell cordovan lasts 5–7 years with regular maintenance (periodic cleaning, air-drying after water contact). A vegetable-tanned calf strap typically reaches 4–5 years. To extend strap life, avoid prolonged direct sunlight, extreme humidity and salt water. A bespoke strap from an artisanal atelier, thanks to superior leather quality and stitching, easily reaches 8–10 years of daily use.