Strap for Speedmaster Professional Missions Apollo 9

The lug width is 20mm. This measurement is taken between the metal terminals (lugs) of the case, from the inner edge to the inner edge of the pin. The 20mm configuration is specific to the classic Speedmaster collection and is not interchangeable with the 21mm or 22mm of other Omega models. Verify the measurement with a caliper before purchasing an aftermarket strap.

The choice depends on the intended use and desired aesthetics. Black alligator offers formal elegance and evolving patina over time. Vegetable-tanned calf ensures sustainability and predictable aging. Shell cordovan provides extraordinary robustness and unique light reflection. Cotton-nylon NATO fabric replicates military heritage and guarantees practicality. Technical rubber is ideal for aquatic environments without compromising water resistance.

The change is straightforward: position the watch on a flat surface, locate the pin (metal bar that runs through the lugs), use a dedicated tool (spring bar tool) or a fine needle to push the small spring inside the pin hole, extract the pin. Once the lugs are free from the old strap, insert the new strap while supporting the pin, push the pin into position until it clicks. Verify that the strap is firmly secured.

Yes, the reference 35971300 is an alternative designation for the Speedmaster Moonwatch 3597.13.00: identical case, identical lugs. Any 20mm strap is compatible. However, always verify that the manufacturer confirms 20mm compatibility and that the strap is not made with excessive thickness that would make it too stiff at the case lugs.

The lifespan of a leather strap depends on the frequency of use, exposure to moisture and sweat, and the quality of the tanning. Properly dyed alligator resists an average of 3-4 years of daily use before showing visible wear. Vegetable-tanned calf can last 2-3 years. Shell cordovan, due to its intrinsic robustness, exceeds 5 years if subjected to regular maintenance (regular cleaning, leather hydration). The Casati Milano warranty on personalized straps is 18 months.