Strap for Speedmaster Broad Arrow Stainless Steel / Black

The Omega Speedmaster Broad Arrow 3851.50.11 features a 20mm lug width. This measurement is specific to the 42mm case diameter and is determined by the distance between the lug terminals. To verify it correctly, measure the internal space between the case lugs using a calliper: it must match exactly 20mm.

The best material depends on usage and personal style. For formal elegance, black alligator develops a geometric grain that pairs perfectly with the brushed steel case. For everyday versatility, vegetable-tanned calf leather matures over time and develops a patina that accompanies the natural evolution of the case. For technical use, a rubber strap maintains the chronograph's instrumental identity. A steel deployant clasp completes the case aesthetics.

Strap replacement requires a spring bar tool to extract the lug pins. Position the watch with the lug facing upward, locate the small lateral hole of the pin, insert the extractor and gently push until the pin comes out completely. Repeat the operation on the other lug. Insert the new strap's pins into the lugs following the correct direction: the pin must penetrate from one side and exit the other, locking with a slight click. Avoid forcing to prevent damage to the 20mm lugs.

Yes, any strap with a 20mm lug width is compatible with the Speedmaster Broad Arrow 3851.50.11, provided you use spring bars of the correct length and diameter. MilanoStraps offers a complete collection of 20mm straps in alligator, calf, rubber and fabric, all customisable in colour, stitching and length. The Casati Milano atelier also creates fully bespoke straps with direct choice of materials and 18-month warranty.

A quality leather strap, with vegetable tanning, lasts approximately 3-5 years with moderate daily use, developing a natural patina that makes it increasingly distinctive. Durability depends on ambient humidity, sun exposure and frequency of use. Straps made with noble leathers such as alligator tend to last longer thanks to the denser skin structure. A rubber or technical fabric strap can last 5-7 years while maintaining better resistance to water and tearing.