Strap for Speedmaster 57 Co-Axial Red Gold / Silver / Bracelet

The lug width of the Speedmaster '57 is 20 millimetres. This corresponds to the distance between the spring bars that attach the strap to the case. This measurement is fixed to maintain mechanical compatibility and the aesthetic balance of the model.

Fine-grain alligator represents the most coherent choice with the formal identity of the Speedmaster '57 in red gold. If you seek a patina that evolves over time, shell cordovan is superior. For those who prioritize sports functionality, vegetable-tanned calf or FKM rubber with a deployant clasp offer practical versatility without compromising the dignity of the red gold case.

Strap replacement is performed by removing the spring bars that attach the strap to the case lugs. A dedicated tool (spring bar tool) is required to compress the spring and extract it. After removing the old strap, insert the new one by aligning the spring bars with the lugs, then release the spring bar allowing it to reposition. The operation requires caution to avoid scratching the case, particularly on red gold where marks are more visible.

All straps cut for 20mm lug width are mechanically compatible with the Speedmaster '57. Straps from milanostraps.it are crafted specifically for this size and available in various premium leathers: alligator, shell cordovan, vegetable-tanned calf, NATO, and rubber. Customization in dimensions and stitching thread allows perfect adaptation to individual wrist size.

Durability depends on the material and intensity of use. A premium-quality alligator, under moderate wearing conditions (worn 3-5 days weekly), maintains its structural properties for 4-6 years. Shell cordovan lasts longer thanks to fibre density. Vegetable-tanned calf, being more porous, has a slightly shorter lifespan (3-5 years). All milanostraps.it straps include an 18-month warranty and can be regenerated through the Casati Milano atelier.