IWC
Portofino IW3565-09— lug 20mm

The IWC Portofino IW3565-09 features a 20mm lug width. This measurement is the standard for the 40mm case of this model and requires straps specifically designed for this width. The correct measurement is taken from the inner edge of one lug to the inner edge of the other lug at the point where the strap attaches to the case.

For the Portofino IW3565-09 we primarily recommend vegetable-tanned alligator or shell cordovan, which enhance the classic aesthetic of the stainless steel case. Vegetable-tanned calf leather is a balanced alternative for those seeking practicality without aesthetic compromise. For the milky white dial, dark brown, matte black, or burgundy tones ensure lasting chromatic harmony.

Strap replacement on the Portofino IW3565-09 is performed using a small tool (spring bar removal) or quick-change mechanism. Procedure: position the watch with the lugs facing outward, gently press downward on the spring bar along the internal guide, remove the previous strap, insert the new one aligning it perfectly with the guides, and ensure the spring bars click securely into place with a crisp "click" sound.

Yes, 20mm aftermarket straps are fully compatible with the Portofino IW3565-09, provided they respect the exact lug width measurement. Choosing high-quality straps made from premium leather or certified rubber ensures longevity and aesthetic affinity with the stainless steel case. Avoid budget solutions with poor manufacturing tolerances.

The lifespan of a leather strap depends on the type and daily use. Vegetable-tanned calf leather: 3-5 years with moderate wear. Vegetable-tanned alligator: 5-8 years. Shell cordovan: 6-10 years thanks to superior structural density. Exposure to sunlight, perspiration, and humidity accelerates aging. Proper maintenance (regular cleaning, annual conditioning) significantly extends the useful life of the strap.