Strap for Portofino Automatic / Stainless Steel / Silver / Strap

The lug width is 20 millimetres. This is the internal space between the case attachment pins, measured from inside to inside. Any 20mm strap will be compatible with your Portofino IW3533-10. Always verify this dimension before purchase to avoid errors.

The best choice depends on usage and personal preference. For formal occasions, polished black alligator delivers maximum drama. For daily business wear, tan vegetable-tanned calf offers aesthetic balance and versatility. For humid environments, structured rubber maintains functionality without sacrificing elegance. Casati Milano's atelier can guide your selection based on your wrist and wearing context.

The Portofino uses simple threaded pins (spring bars). Obtain a proper strap change tool or spring bar removal kit, then: 1) Disengage the old strap by pushing the pins through the case attachment holes. 2) Position the new strap, aligning the attachment holes to the case lugs. 3) Reinsert the pins until they click into place. Never use hammers or improvised tools—risk of scratching the stainless steel case. If uncertain, Casati Milano offers a change service by appointment.

Yes, any 20mm strap is compatible. milanostraps.it's bespoke straps are handcrafted to ISO 3591 specifications and tested on watches in the same category. Choosing a quality strap—in alligator, vegetable-tanned calf, or structured rubber—preserves the aesthetic value of the IW3533-10 reference and guarantees superior durability compared to disposable commercial alternatives.

A premium leather strap (alligator, shell cordovan) lasts 7-10 years of daily wear, developing natural patina and controlled ageing. Vegetable-tanned calf offers 5-7 years before requiring refinishing or replacement, depending on environmental humidity and maintenance. Structured rubber exceeds 10 years without degradation. Casati Milano provides an 18-month warranty on all straps and offers re-edging and restoration services to extend useful life.