Strap for Portugieser Automatic 40 Stainless Steel / Salmon

The IWC Portugieser IW3583-13 is equipped with 20 mm lug width. This measurement is critical for compatibility with aftermarket straps and bracelets. To verify it, position two parallel rulers in the space between the watch lugs: they must be exactly 20 mm apart. This lug width is widely available in the market, particularly amongst classic watch models, allowing extensive strap selection.

Alligator leather with vegetable tanning represents the most elegant choice and is historically coherent with Portugieser philosophy, developing natural patina over time. Fine-grain calf leather with vegetable tanning offers minimalist aesthetics and ages gracefully. Shell cordovan delivers extraordinary durability and progressive lustre patina. For casual contexts, synthetic NATO or vulcanised rubber shift focus towards functionality. The choice depends upon intended use and personal aesthetic preference.

Strap replacement requires a dedicated tool to remove the spring bars connecting the lugs to the case. Position the watch on a soft, stable surface. Insert the screwdriver into the lateral opening of the spring bar to destabilise it slightly, then remove the old strap. Align the holes of the new strap with the lugs and reinsert the spring bars, verifying they are securely seated. Never force: smooth motion indicates correct positioning. If uncertain, consult an authorised service centre.

Yes, provided the strap is engineered for 20 mm lug width. Quality-certified aftermarket straps respect the same manufacturing tolerances as original IWC straps. However, verify that the strap presents no sharp edges that could scratch the case lugs, and that spring bars are stainless steel to prevent oxidation. Choose suppliers who certify compatibility and offer workmanship warranties.

A strap crafted with vegetable tanning (quality alligator or calf) typically lasts 3–5 years with daily wear, depending upon sun exposure, perspiration, and humidity fluctuations. Shell cordovan tends to last longer, up to 7–8 years, as the fibre is naturally more resistant to wear. Longevity is extended if the strap is regularly air-dried and stored in controlled humidity environments. After the first year, the strap develops natural patina and acquires character. When the leather shows evident signs of failure (edge wear, fibre cracking), replacement is warranted.