Strap for Portofino Automatic Stainless Steel / Black - Breguet / Strap

The lug width (or ansa width) of the IWC Portofino IW3513-21 is exactly 18 mm. This specification is crucial when selecting compatible aftermarket straps. To verify the measurement, use a digital calliper on the spring bar attachments of the case.

The optimal strap selection depends on intended usage. For formal elegance: black alligator or shell cordovan. For daily versatility: vegetable-tanned calf in brown or black. For sporty application: black rubber or NATO fabric. The ideal choice balances the compact proportions of the case (34 mm) with a texture that does not visually burden the wrist.

Strap replacement requires a spring bar tool to remove the spring bar attachments from the lugs. Insert the tool into the small hole on the lug side, lift the metal tang and slide the old strap outward. Insert the new strap through the lugs, ensuring the spring bars are correctly positioned. If you are inexperienced, consult a qualified watchmaker.

Yes, numerous high-quality aftermarket straps are compatible with the 18 mm lug width. Always verify the "18 mm lug width" specification. Atelier Casati Milano crafts bespoke straps with choice of leather, colour, exact sizing and stitching thread. Online retailers offer alternatives in alligator, shell cordovan, calf and rubber ready for immediate shipment.

Longevity depends on leather quality and usage intensity. Premium alligator or shell cordovan resists wear for 4–6 years under daily use. Vegetable-tanned calf typically lasts 2–3 years under intensive wear. Patina evolves gradually, creating aesthetic character. Critical factors: sun exposure, perspiration, humidity and frequency of seasonal rotation. A specialised watchmaker can assess wear and recommend reconditioning when necessary.