Strap for Speedmaster Broad Arrow Yellow Gold / Black / Bracelet

The lug width of the 3151.50.00 is 20 millimetres. This dimension is specific to the model and represents the proportional compromise between the 42mm yellow gold case and wrist ergonomics. Any compatible strap must respect this width: always measure inside to inside of the case lugs using a digital calliper.

For an 18k yellow gold of this calibre, alligator remains the noblest choice: the natural grain of the leather offers elegant tactile contrast without competing with the lustre of the case. Shell cordovan is a rare and precious alternative, developing deep patina over time. Vegetable-tanned calf guarantees chromatic versatility and natural ageing. A preshrunk rubber strap with steel deployant is the contemporary sporty solution.

Remove the old strap by sliding the lateral pin (spring bar) from the case using a dedicated tool (spring bar tool), exerting gentle lateral pressure. Once the strap is removed, align the new strap with the lug holes, insert the spring bar through the new strap and lock it into the case recesses. Verify that the strap is positioned evenly on both sides.

Yes. Many artisanal strap manufacturers produce 20mm lugs compatible with the 3151.50.00. Compatibility also depends on the depth of the lugs (approximately 4.5mm on the 3151.50.00) and the tolerance of the lug width for spring bar insertion. Always consult the manufacturer to verify construction specifications before purchase.

A quality leather strap (alligator, shell cordovan, vegetable-tanned calf) lasts an average of 3-5 years with moderate daily use. Longevity depends on frequency of use, exposure to moisture and perspiration, and maintenance (periodic cleaning and conditioning). A preshrunk silicone rubber strap lasts an average of 4-6 years. Noble materials such as shell cordovan, if well maintained, can last over a decade.