Strap for Portuguese Chrono-Automatic White Gold / Ardoise / Diamond

The IWC Portugieser IW3714-39 features a lug width of 20 millimetres. This measurement, also referred to as strap width, indicates the exact distance between the two lugs on the watch case where the strap attaches. To verify compatibility, measure the gap between the lateral lugs: it must be precisely 20 mm. Fitting a strap of incorrect width risks damaging both the strap and the case lugs.

The optimal strap choice depends on intended use and aesthetic preference. For formal elegance, black or dark brown alligator provides maximum alignment with IWC's horological tradition. If you seek character and natural ageing, vegetable-tanned calf leather in cognac or brown tones develops visible patina over time. For a balanced choice between formality and versatility, shell cordovan in burgundy combines tactile density with natural sheen. For sports contexts, a grey-blue military rubber strap with deployante maintains robustness without compromise.

To change the strap, position the watch on a soft, flat surface. Using a dedicated spring bar tool or small lever, gently press the elastic pin supporting the lug downward. Once the pin retracts, carefully withdraw the strap. Insert the new strap, verifying the width is precisely 20 mm, then press the pin into its seat until it clicks securely. Repeat for the second lug. If uncertain, Atelier Casati Milano provides professional strap replacement with technical guidance.

All straps with a 20 mm lug width are compatible with the IWC Portugieser IW3714-39. Compatibility depends exclusively on strap width, not brand affiliation. At milanostraps.it you'll find a comprehensive collection of 20 mm straps in alligator, shell cordovan, calf leather and rubber, all engineered to match the brand's constructive quality. Customisation in length, initials and thread colour ensures perfect wrist fit.

Leather strap longevity depends on material, tanning method and daily use. An alligator strap, properly maintained, lasts 3-5 years in regular wear. Shell cordovan, being denser, can endure 5-7 years. Vegetable-tanned calf typically lasts 2-4 years whilst developing visible patina characteristic of natural ageing. Humidity, temperature fluctuations and perspiration accelerate deterioration. Casati Milano offers 18-month warranty and recommends periodic maintenance with specialist creams to preserve leather elasticity.