Strap for Speedmaster Co-Axial Stainless Steel / White / Bracelet / Olympic Collection

The lug width is 20 millimetres. Always measure perpendicular to the watch terminals, from shoulder to shoulder: this is the correct distance for any replacement strap. Attention: a difference of just a few millimetres makes the strap incompatible.

Vegetable-tanned alligator is the most traditional choice, as its characteristic grain communicates membership in a class of professional timekeepers and develops a unique patina over time. For a sports approach, high-density rubber keeps the strap soft even during movement when operating the chronograph pushers. Bull calf offers a balance between elegance and robustness.

Remove the metal terminals (lugs) from the case using a spring bar removal tool, available from any watchmaker. Insert the new strap into the case ensuring the lug is completely seated in the terminal, then reinsert the second terminal. Always verify that the strap is not twisted during the process. Casati Milano offers assistance for custom fitting.

Yes, provided the lug width is exactly 20 millimetres and the length is sufficient for your wrist. Milanostraps 20mm straps are fully compatible with your Speedmaster 321.10.42.50.04.001 and customizable in leather, colour and stitching. Avoid straps with imprecise tolerances to protect both the strap and your watch terminals.

A high-quality alligator or calf strap typically lasts 3-5 years with regular daily use, extendable to 7-10 years with care (protection from excessive moisture and periodic stitching lubrication). A NATO strap offers greater resistance to wear (5-8 years), while FKM rubber maintains structural integrity for 4-6 years. Milanostraps straps include an 18-month warranty.