Strap for Seamaster Master Co-Axial 39.5 Olympic Timekeeper Stainless Steel / White / Black

The lug width is 20mm. This measurement is critical for strap compatibility: 18mm or 22mm straps are not compatible. Measurement is performed with a digital caliper, positioning the shoulders on the inner face of the lug.

Satin black alligator represents the luxury solution, with texture that naturally complements the case. Italian vegetable-tanned calf offers distinguished aging. FKM rubber is recommended for those who use the watch frequently in marine environments. Swiss cordovan, if available, develops a unique burgundy patina.

The strap is replaced by removing the spring bars that connect the strap to the case. We use a dedicated tool (spring bar lever) to lift and extract the bar without damaging the lugs. Our artisanal straps are fitted with standard compatible spring bars. If you do not have the tool, the Casati Milano atelier offers a strap change service.

Yes, any strap with a 20mm lug width is compatible. We recommend artisanal leather or rubber solutions of quality to maintain the constructive coherence of the watch. Avoid generic inexpensive straps: the Seamaster deserves aesthetic proportion and solid spring bars.

In daily use with occasional water exposure, a quality calf strap lasts 3-4 years. Cordovan and alligator extend to 5-7 years. Vegetable tanning ages with elegance, developing patina. Our artisanal straps include an 18-month warranty and can be regenerated at the Casati Milano atelier to extend their useful life.