Strap for Portuguese Chrono-Automatic Stainless Steel / Lucerne

The lug width is precisely 20.00 mm. This measurement is specific to this reference and represents a construction standard determined by the proportions of the 40.90 mm case. Measurement must be taken internally, wall to wall, using a digital calliper positioned perpendicular to the lug axis.

To maintain the constructive coherence of this chronograph, alligator leather in vegetable tanning represents the optimal choice. The geometric texture and patina developed over time reflect the minimalist philosophy of the dial. Valid alternatives include vegetable-tanned calf leather for uniform texture, or shell cordovan for nearly metallic density. Avoid synthetic or industrially treated straps.

Strap replacement requires a specific tool (spring bar tool or lug puller) and care to avoid damaging the steel guides on the case. Position the watch on a stable surface, insert the tool into the side groove of the lug and press downward to push the pin outward. Repeat for both sides. If inexperienced, entrust the task to a qualified watchmaker to prevent scratches or deformation.

Yes, 20 mm aftermarket straps are fully compatible with the Portugieser IW3714-66 provided they strictly respect the lug width specification. Undersized straps (19.5 mm) risk instability; oversized straps (20.5 mm) force non-ergonomic angles. Choose straps from reliable sources that guarantee construction precision and material quality.

A quality vegetable-tanned leather strap, with ordinary maintenance, lasts between 3 and 5 years on a daily-worn watch. Shell cordovan, due to superior density, can extend this interval to 7 years. Vegetable-tanned calf falls between 4 and 6 years. Lifespan depends on sun exposure, humidity, wearing frequency and occasional application of protective creams. Rubber straps maintain functionality for 5-8 years before yellowing and becoming brittle.