Strap for Speedmaster Broad Arrow 1957 Stainless Steel / Red Gold / Brown / Bracelet

The lug width is exactly 20 mm. This is the standard attachment width between the case lugs and remains constant on all Speedmaster Broad Arrow models from 1970 to today. Always verify by measuring the vertical space between the two lugs, not the case itself.

Black alligator or tobacco brown alligator is the reference choice, as the fine grain complements the rose gold finishing elegantly. Alternatively, vegetable-tanned calf leather offers a patina that evolves over time, aligning with the natural aging of rose gold. For a more vintage approach, military-grade NATO fabric reflects the Speedmaster's aeronautical heritage.

The strap is replaced by removing the lugs using a dedicated tool (spring bar remover) or with the help of a watchmaker. Insert the small metal pin into the attachment holes and push sideways to extract the lugs. Insert the new lugs into the replacement strap and secure again to the case terminals. If you are not experienced, consult a professional to avoid scratches.

Yes, all straps with a 20 mm lug width are compatible with the Broad Arrow 321.90.42.50.13.002, regardless of brand. What matters is verifying that the attachment width is exactly 20 mm and that the strap is robust enough to support the weight of a rose gold and steel case (approximately 150-160 grams).

A high-quality leather strap (alligator or vegetable-tanned calf) has an average lifespan of 3-5 years with daily use, provided it is kept dry and not exposed to prolonged moisture. The rose gold and steel of the Broad Arrow create an aggressive environment for leather: salt, sweat, and sun exposure accelerate aging. Artisanal straps from Casati Milano offer 18 months of free replacement for manufacturing defects.