Strap for Portuguese Chrono-Automatic Stainless Steel / Silver

The lug width of the IWC Portugieser IW3714-45 is 20.00 mm. This measurement represents the internal distance between the two lugs on the case and is the reference standard for selecting compatible straps. Accurate measurement requires a digital calliper positioned at the deepest point where the strap rests against the case.

For the Portugieser IW3714-45, premium materials are recommended: genuine alligator, vegetable-tanned calf leather, or shell cordovan. Alligator highlights the contrast between organic texture and the satinised steel case. European calf offers both aesthetic and practical versatility. Shell cordovan ensures maximum resistance to wear whilst maintaining formal elegance. For sporty contexts, butadiene rubber straps deliver functionality without compromise.

Strap removal is achieved by extracting the spring bars from the case lugs using a dedicated tool. Insert the narrow end of the tool into the spring bar opening, apply gentle pressure to compress the internal spring, then withdraw the strap. For installation of a new strap, align the holes with the spring bars and press firmly until fully seated. Work on a soft surface to prevent case damage.

Yes, any strap with a 20 mm lug width is compatible with the Portugieser IW3714-45. However, the construction quality of the strap significantly impacts overall experience. Bespoke straps crafted from vegetable-tanned leather, genuine alligator, or shell cordovan guarantee natural ageing and superior aesthetic compatibility compared to industrial production. Always verify that the strap features correctly sized lugs, typically 1.8 mm in diameter.

Leather strap longevity depends on material, tanning process and daily usage. An alligator or shell cordovan strap with vegetable tanning maintains structural integrity for 3 to 5 years with regular wear. European calf has comparable lifespan, around 3–4 years. Critical factors include ambient humidity, direct sunlight exposure, and periodic maintenance. A bespoke strap receiving conscientious care can exceed 5 years whilst developing patina and retaining functionality.