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

The lug width of the IWC Portugieser IW3714-90 is precisely 20.00 millimetres. This dimension does not allow for variations: a 19mm strap sits with excessive play, whilst a 21mm strap will not fit at all. Measurement is performed using a digital calliper positioned parallel to the inner shoulders of the spring bar seat—an essential operation before purchasing any aftermarket strap.

For the Portugieser IW3714-90 we recommend alligator, vegetable-tanned calf, or shell cordovan from horse leather. Alligator in brown or cognac tones reinforces the instrument nature of the watch whilst maintaining elegance. Shell cordovan develops natural patina over time and represents a multi-year investment. Vegetable-tanned calf offers balance between aesthetics and daily practicality. For sporty contexts, a military-grade cordura NATO maintains functionality without stylistic compromise.

Strap replacement on the Portugieser IW3714-90 requires a quality spring bar removal tool. Position the watch on a stable surface, insert the flat tip of the tool beneath the lateral spring bar to compress the internal spring, then extract the lug pin. Repeat on the opposite side, then insert the lugs of the new strap, ensuring they click firmly into place with deliberate pressure. The operation demands care to avoid scratching the stainless steel case.

Yes, any strap with a 20mm lug width is compatible with the IW3714-90. Compatibility depends entirely upon lug width, not the strap manufacturer. Always verify the dimension before purchase: 20.00mm is standard, though some vintage productions or small artisans may vary by tenths of a millimetre. On milanostraps.it you will find 20mm straps engineered to this specification.

Lifespan depends upon material and usage patterns. A quality alligator or shell cordovan endures 5–7 years with daily wear and rotation amongst other straps. Standard calf lasts 3–4 years under the same scenario. Primary deterioration occurs at the buckle (deployante or pin buckle) and at the lug attachment points, where perspiration accelerates wear. Rotating straps and protecting from excessive humidity significantly prolongs life. Straps crafted with vegetable tanning age more gracefully aesthetically, developing patina rather than degradation.