Omega
Speedmaster Moonwatch 3592.50.00 I— lug 20mm

The lug width of the 3592.50.00 I is 20mm. This standard, inherited from the Apollo 11 project, ensures proper strap anchoring to the case lugs and visual balance with the 42mm case diameter. To verify compatibility, measure the horizontal distance between the two lugs with a digital caliper: the strap must fit without forcing.

There is no single answer: it depends on usage and the aesthetic contrast you desire. Natural alligator emphasizes the formal and historical dimension of the Moonwatch. Vegetable-tanned calf leather imparts a more vintage appearance and develops a patina over time. A tactile NATO strap in nylon maintains the military-aerospace heritage. A rubber strap ensures resistance and daily practicality. The best choice is the one that reflects your personal relationship with the watch: wrist museum or work tool.

The strap is replaced by removing the spring bars that connect it to the lugs. Proceed as follows: position the watch on a soft pad to prevent scratches, use a strap-changing tool (available from watchmakers and online) to compress the spring bar on one side, slide the strap outward, and remove the spring bar. To install the new strap: insert the spring bar into the seats of the opposite lug, compress slightly, and slide the strap until it locks in place. If the spring bars are worn or if you are hesitant about changing the strap yourself, entrust the task to a certified watchmaker to avoid damage to the lugs.

Compatibility depends on lug width. If another Omega watch has a lug width of 20mm, the strap is interchangeable. Examples: Seamaster Diver 300M in certain configurations, Aqua Terra, some vintage Speedmaster models. If the other Omega has 18mm, 22mm, or a different lug width, the 20mm strap from the Moonwatch will not fit correctly. Always verify the lug width of the secondary model before purchasing universal straps.

The lifespan of an artisanal leather strap depends on frequency of use, climate, and leather quality. Natural alligator with vegetable tanning, worn daily, has an average life of 3–5 years before requiring replacement. Resistant calf leather can last 4–6 years. A rubber or NATO strap is virtually indestructible, except for aesthetic wear. Atelier Casati Milano offers an 18-month guarantee against manufacturing defects: premature stress on stitching or tears due to manufacturing defects are covered and repaired free of charge.