Strap for Portofino Day & Night 34 Stainless Steel - Diamond / Blue

The lug width of the IWC Portofino IW6598-01 is 16mm. This measurement represents the distance between the two metal spring bars that protrude from the case. It is essential to verify this dimension before purchasing an aftermarket strap, as 16mm is not a universal size like 18mm or 20mm. All 16mm straps on milanostraps.it are tested and certified to be compatible with this model.

The Portofino IW6598-01, given its elegant proportions and classical character, pairs magnificently with natural materials. Alligator with vegetable tanning emphasises formal elegance and develops a natural patina over time. Vegetable-tanned calf leather offers immediate suppleness and versatility. Shell cordovan guarantees extreme durability with natural lustre. For those preferring practicality, rubber or NATO cloth straps maintain the classical DNA without functional compromise.

Changing the strap on the Portofino IW6598-01 is a straightforward operation requiring no specialist tools beyond a small spring bar tool (or a blunt manual implement such as a smoothed wooden stick). Position the watch with the lugs facing upward, locate the small hole on the spring and gently insert the tool to release the metal pin from its seat. Repeat for the other lug. Insert the new strap by aligning the holes and press until you hear the click of engagement. If you prefer to avoid any risk, the Casati Milano atelier offers a strap-change service with final security verification.

Yes, provided the strap is specifically dimensioned for the 16mm lug width. milanostraps.it offers a dedicated collection of 16mm straps selected and tested to guarantee complete compatibility with the Portofino IW6598-01. The use of uncertified 16mm straps compromises watch security and may damage the lugs. Each strap purchased is supplied with a guarantee covering construction and compatibility.

The lifespan of a leather strap depends on usage intensity, tanning method and environmental conditions. An alligator or vegetable-tanned calf strap, with proper care (regular drying, protection from moisture), lasts 5–7 years. Shell cordovan, owing to the dense fibre structure, reaches 10–15 years. Critical factors are moisture (which accelerates degradation), prolonged direct sun exposure and mechanical stress on the stitching. Casati Milano provides an 18-month warranty on all bespoke straps, covering manufacturing defects and wear under normal conditions.