Strap for Speedmaster Moonphase Chronograph Master Chronometer Stainless Steel / Black / Bracelet

The lug width is 21 mm. It is measured in the internal groove between the two anchor pins of the strap, from inner edge to inner edge. This dimension is critical to ensure a perfect fit and allows no variation: a strap of a different size would be incompatible with the case lugs.

Vegetable-tanned alligator is the most versatile material: the fine grain creates an ideal aesthetic dialogue with the black ceramic case, maintaining an elegant yet sporty profile. Alternatively, aged rough calf leather (dark brown tones) offers a more casual personality, while FKM rubber guarantees maximum resistance and water resistance. The choice depends on the context of use and personal aesthetic preferences.

The process requires a spring bar tool (double-ended instrument). Position the watch horizontally, insert the thin tip of the tool into the side groove of the lug to compress the spring pin. With your other hand, gently pull out the strap. Repeat on the opposite lug. For insertion, align the pins of the new strap inside the lugs, push until the pin snaps into position. An experienced operator, such as the team at Casati Milano, can perform the operation in minutes without risk to the case.

Yes. Any strap with a 21 mm lug width is compatible. However, construction quality and the type of leather or material vary significantly between suppliers. Bespoke leather straps crafted at Casati Milano are built with selected hides, optimized thickness (1.4–1.6 mm) and 18-month warranty, ensuring longevity and aesthetic coherence with the refinement of the Omega movement.

Durability depends on leather quality, thickness, maintenance, and frequency of use. A quality alligator strap, with thickness 1.4–1.6 mm, typically lasts 4–6 years under average daily use. Premium leathers such as shell cordovan offer superior longevity (6–8 years), developing a characteristic patina. An FKM rubber strap lasts 5–7 years while maintaining elasticity. Regular maintenance (cleaning, drying after moisture exposure) significantly extends useful life.