Strap for Speedmaster Broad Arrow Co-Axial GMT Stainless Steel / White

The Omega Speedmaster Broad Arrow 3881.30.37 has a lug width of 21 mm. This is the distance between the two spring bars that protrude from the case. To verify it, measure horizontally between the spring bars: the value must be exactly 21 mm. This width is specific to the Broad Arrow family and reflects the proportions of the 44.25 mm diameter case.

For this chronograph we recommend an American alligator strap in cognac color, or black vegetable-tanned calf leather. Both enhance the satin case without competing visually with the dial. If you prefer sporty versatility, a matte FKM rubber strap is ideal. It is essential to pair it with a satin steel deployant to ensure torsional stability on the wrist.

The strap is changed using a spring bar tool to remove the spring bars from the case lugs. Press gently toward the center of the case while keeping the tool perpendicular, then remove the spring bar. Insert the spring bars into the new strap, ensuring that the lugs are properly seated. Finally, reinsert the bars into the case until you feel a slight click for security.

Yes, any strap with a 21 mm lug width is compatible with the Broad Arrow 3881.30.37. Online you will find ready-to-ship straps, customizable in material, color, initials and stitching thread. For a complete bespoke experience, the Casati Milano atelier creates custom straps with an 18-month warranty.

A quality handcrafted leather strap lasts an average of 4-5 years of daily use, even up to 7 years if rotated with other straps. Durability depends on the tanning method (vegetable tanning resists better), frequency of use, climatic conditions and maintenance. Prolonged exposure to humidity or heat accelerates aging. To maximize service life, alternate multiple straps and store them in a temperature-controlled environment.