Strap for Portofino Automatic Stainless Steel / Silver

The IWC Portofino IW3565-01 features a lug width of 20mm. This measurement represents the distance between the two lugs (spring bar posts) that secure the strap to the sides of the case. To verify this dimension, remove the original strap and measure the space between the two lugs: you will find exactly 20mm, a common standard among classical medium-sized timepieces.

For the IWC Portofino IW3565-01, straps in alligator leather with vegetable tanning are recommended to emphasise the model's formal elegance. Alternatively, calf leather with natural patina development adds a more everyday character, while shell cordovan represents the most refined choice for those seeking rare and durable leather. For informal contexts, FKM rubber or NATO nylon offers practicality without aesthetic compromise.

To change the strap on the IWC Portofino IW3565-01, use a spring bar tool: insert the small end into the lateral groove of each spring bar, apply gentle downward pressure to compress it, then extract the bar from the lugs. Insert the spring bars into the new 20mm strap, aligning the holes, and release the bar slowly into the second side of the case. The procedure requires care to avoid scratching the case and to prevent losing the spring bars.

Yes, it is possible and recommended. A quality aftermarket leather strap in artisanal leather measuring 20mm lug width fits the IWC Portofino IW3565-01 perfectly. Straps crafted with vegetable tanning or shell cordovan offer superior longevity compared to the original strap and develop unique patina over time. Always verify the 20mm lug width and choose specialised suppliers to ensure finishes and leather selection consistent with the watch's quality.

A quality leather strap crafted with vegetable tanning lasts an average of 5–7 years of moderate daily use. Durability depends on sun exposure, humidity, and frequency of use. Shell cordovan, thanks to fibre density, can reach 10–12 years. FKM rubber or NATO nylon guarantee similar durations (5–8 years) with minimal maintenance. Natural ageing of leather does not represent a defect, but rather an aesthetic quality of patina and personalisation.