Strap for Speedmaster Professional Missions Apollo 17

The lug width is exactly 20mm. This dimension is specific to the Speedmaster Moonwatch case and should not be confused with standard sizes of 18mm or 22mm. To verify compatibility with precision, measure the distance between the inner edges of the lugs with a digital caliper: the value must fall between 19.8 and 20.2mm to ensure a perfect fit without lateral play.

Vegetable-tanned alligator represents the atelier choice, as the natural texture stabilizes the strap on the skin and the initial rigidity softens over time, developing a patina. Shell cordovan is ideal if you desire lower maintenance and natural lustre. Rubber strap is essential for aquatic use and humid environments. Nylon NATO honours the historical space heritage while maintaining technical practicality.

Remove the current strap using a spring bar tool inserted perpendicular to the lug pin, gently compressing the internal spring until the pin is freed. Insert the new strap by aligning the lateral holes with the lugs, then release the spring button: the pin will snap into the locking position. Verify that the strap has no lateral play by gently moving your wrist. If the strap is leather, avoid wetting it in the hours following installation.

Yes. 20mm straps available online are compatible if they respect the width tolerance (19.8-20.2mm) and do not have lateral play on the lugs. Bespoke handcrafted straps offer maximum quality control: selected leathers, natural thread stitching, and perfect aesthetic proportion with the 42mm case diameter. The Casati Milano atelier manufactures bespoke straps with an 18-month warranty.

A high-quality alligator or cordovan strap resists 3-5 years of daily use, provided it is dried correctly after exposure to humidity and not subjected to repeated torsional stress. Vegetable tanning matures progressively, developing a patina that increases fibre resistance over time. If the strap begins to show cracks in the rear fold or mould odour, it is time to replace it. Rubber resists 5-10 years without degradation if not exposed to direct ultraviolet light for prolonged periods.