Strap for Speedmaster 57 Co-Axial Stainless Steel / Black Vintage / Bracelet

The lug width of the Speedmaster '57 ref. 331.10.42.51.01.002 is 20mm. This measurement is Omega's standard for models with a diameter exceeding 40mm. To verify it, position a digital caliper between the internal ends of the lateral lugs: the value must be exactly 20mm. No 19mm or 21mm strap will be compatible without risking instability.

For the Speedmaster '57 331.10.42.51.01.002 we recommend four options: genuine alligator for pure elegance with patina over time; vegetable-tanned calf for everyday versatility; NATO in canvas for pragmatism and quick change; shell cordovan for extreme artisanal quality. FKM rubber is ideal for those seeking absolute water resistance. The choice depends on use: formal evening wear, versatile daily use, adventurous, or technical.

Changing the strap requires the use of a spring bar tool (two-pronged lever): insert the small prong into the hole under the lug to compress the internal spring, gently lift the end of the old strap and retract the elastic pin. Once removed, repeat the operation from the opposite side. For the new strap, align the lug with the lugs, insert the elastic pin using the lever and verify that it clicks completely. If you do not have the tool, Casati Milano offers a strap change service with personalized consultation.

Yes, provided the lug width is exactly 20mm and the strap has been constructed to precise tolerances. MilanoStraps offers a complete collection of artisanal straps compatible with 20mm lugs, customizable in material, color, length and thread color. Each piece is handcrafted in Italy to quality standards that respect the Swiss precision of the Omega case.

Durability depends on the material and use: vegetable-tanned calf withstands 2-3 years of intensive daily use; alligator reaches 4-5 years if protected from excessive moisture and rotated seasonally; artisanal shell cordovan can last 5-7 years developing a precious patina. Casati Milano straps come with an 18-month warranty against manufacturing defects. Periodic maintenance and protection from direct sunlight significantly extend the life of the strap.