Strap for Speedmaster 57 Master Chronometer 40.5 Stainless Steel / Green / Bracelet

The lug width of the Speedmaster '57 332.10.41.51.10.001 is exactly 20mm. This dimension represents the distance between the case attachments and must be respected to ensure correct strap placement without lateral play or excessive pressure on the steel lugs.

For a chronograph of this historical significance, alligator is the most appropriate choice: regular grain and natural patina create harmony with the lacquered black dial, maintaining professional elegance. Alternatively, vegetable-tanned calf or shell cordovan offer different character while maintaining high construction quality.

The strap is inserted through the lugs by threading the end into the lug passage, then sliding the strap until it is fully seated. For removal, reverse the process, taking care not to force it to avoid damaging the steel contact points. Some straps require specific tools (spring bar remover) for quick changes.

Any strap with 20mm lug width is compatible. On milanostraps.it you will find a selection of handcrafted straps ready for shipment: alligator, calf, shell cordovan, high-performance synthetics. All meet construction specifications to ensure dimensional compatibility and durability in use.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) has an average lifespan of 5-7 years with daily use, thanks to natural aging that strengthens the patina. Longevity depends on exposure to moisture, sweat and intensity of use. Artisanal straps from milanostraps.it include an 18-month warranty and can be restored at the Casati Milano atelier.