Strap for Seamaster Aqua Terra 150M Master Chronometer 38 Stainless Steel / Sedna Gold / Blue / Alligator

The lug width of this model is 19mm. This dimension is precise and non-negotiable: an 18mm strap will leave visible gaps, while a 20mm strap will not fit into the lugs. Correct measurement is performed with a digital caliper between the internal spring bar pins, not from the external width of the case.

To enhance the two-tone character of the 220.23.38.20.03.001, we recommend vegetable-tanned alligator (ochre and tobacco) or French shell cordovan, which develops a luminous patina and pairs elegantly with rose gold. For more formal occasions, premium calf leather is ideal; for light summer and water activities, premium technical rubber in black maintains proper proportions.

The strap is changed by acting on the two lateral spring bars with a spring bar tool: a small lever that compresses the internal spring, releasing the pin. The procedure takes 2 minutes and requires no watchmaking skills. Casati Milano also offers strap change service by appointment, with personalized consultation on selecting your new strap.

A quality artisanal aftermarket strap offers aesthetic personalization, choice of noble leathers, and functional versatility. An original Omega strap guarantees perfect color and texture matching, but limits your options. For the two-tone 220.23.38.20.03.001, an artisanal strap in alligator or shell cordovan often imparts more character and longevity than the factory solution.

A quality artisanal leather strap lasts 5-8 years with frequent wear (nearly daily), provided it receives annual maintenance: gentle cleaning, natural conditioning, and stitching inspection. Vegetable-tanned leather develops patina and ages magnificently; shell cordovan can last up to 10 years if properly maintained. Casati Milano provides an 18-month warranty on all custom straps and offers periodic refresh services.