Strap for Speedmaster Professional Missions Gemini XII

The Omega Speedmaster Moonwatch 3597.10.00 features a lug width of 20mm. This width was chosen with precision to maintain the correct proportions between the 42mm diameter case and the strap, ensuring comfort and stability on the wrist.

There is no absolute choice, but it depends on usage. For elegance and natural patina, vegetable-tanned alligator is the most refined solution. For versatility, calf leather offers a subtle texture. For sports-oriented vocations and practicality, rubber or silicone maintain the technical soul of this historic chronograph.

Using a specific tool (spring bar tool), gently release the metal bars (springs) that connect the strap to the case. Once freed, slide out the old strap and insert the new one, clicking the bars back into position. Avoid forcing: violent pressure could damage the case lugs themselves.

Yes, provided the lug width is exactly 20mm. Artisanal aftermarket straps represent an excellent opportunity to personalize your Moonwatch without altering its value, provided they are made by specialized craftsmen who respect construction tolerances.

A quality leather strap, subjected to regular use, maintains structural integrity for 3–5 years. Durability depends on sun exposure, humidity, and frequency of wear. Alligator and vegetable-tanned calf age better, developing a patina that increases their aesthetic character.