Strap for Speedmaster Professional Moonwatch Sapphire Sandwich

The Omega Speedmaster Moonwatch 3573.50.00 has a lug width of 20 millimeters. This measurement is determined by the internal distance between the two lugs of the case and is fundamental for correct strap compatibility. It is recommended to measure with a digital caliper between the internal walls of the lugs to verify the accuracy of the dimension before purchase.

There is no universally 'best' strap, as the choice depends on usage. For formal elegance we recommend black alligator with deployant clasp; for noble patina, vegetable-tanned calf; for authentic sport use, technical rubber or NATO canvas. All materials are compatible with the 20mm lug width and can be customized at the Casati Milano atelier.

The strap is changed using a spring bar tool (a specific tool for the fastening pins). Position the tip of the tool in the lateral groove of the spring, compress the pin and slide off the old strap, then insert the new strap ensuring that both ends of the pin click into place in the lugs. The operation takes approximately 2-3 minutes. If you prefer to avoid any risk, the Casati Milano atelier offers strap change service by appointment.

Yes, any strap with a standard 20mm lug width is compatible with the Speedmaster Moonwatch 3573.50.00, provided that the build quality is consistent with the prestige of the watch. MilanoStraps offers a curated selection of straps in alligator, calf, rubber and canvas, all specifically designed for sports chronographs of this dimensional class and thickness.

The lifespan of a leather strap varies based on material, usage and maintenance. Naturally resistant alligator lasts an average of 3-5 years with daily wear; vegetable-tanned calf can last 2-4 years before showing obvious signs of wear, though it gains character with aging. The Casati Milano atelier provides an 18-month warranty on manufacturing and recommends regular rotation between at least two straps to extend the life of each.