Strap for Speedmaster Broad Arrow 1957 Stainless Steel / Black

The lug width for this model is 20mm. This measurement represents the exact distance between the pins that connect the strap to the case. To verify it, position the watch with the dial facing downward on a flat surface and measure with a digital caliper the distance between the two pins perpendicular to their axis. A correct measurement is essential to ensure that the strap fits perfectly without moving.

The ideal strap depends on use and aesthetic preferences. Alligator represents the classic choice for chronographs: its fine texture does not compete visually with the complex dial. Vegetable-tanned calf ages elegantly and absorbs time like the internal movement. Shell cordovan offers maximum durability and an ever-richer patina over the years. Tropic rubber straps create a fascinating contrast with the brushed steel case, while Barenia military fabric maintains aesthetic coherence without the artifice of traditional NATO.

The Speedmaster Broad Arrow uses straight lugs with flat passants. To change the strap: position the watch on a soft pad with the lug side facing upward. Use a spring bar tool to gently lift the anchor pin from its seat in the lug bracket. Once the old strap is freed, align the pins of the new strap to the seat and insert them with gentle pressure. Verify that the strap is centered and properly positioned before wearing the watch. If you are unsure, contact a certified expert.

Yes, any strap with a 20mm lug width is physically compatible. However, constructive compatibility does not automatically mean aesthetic harmony. Vintage NATO fabric straps may appear disproportionate for this case, while leather straps (alligator, calf, cordovan) maintain coherent visual balance. If you choose an aftermarket strap, verify that the length is appropriate (120-130mm) and that the anchor pins insert securely without looseness. Milanostraps.it and the Casati Milano atelier offer customized solutions that fully respect the specifications of this model.

The lifespan depends on material, tanning method, and intensity of use. A quality artisanal alligator or vegetable-tanned calf strap typically lasts 3-5 years with moderate daily use. Cordovan, being more resistant, can reach 7-10 years. Aging is not deterioration: the strap develops patina and acquired character. If you wear the Speedmaster primarily in formal contexts (2-3 times a week), a leather strap can last even longer. Prolonged exposure to humidity and perspiration, as well as excessive creasing, reduce lifespan. Casati Milano provides an 18-month warranty on all artisanal straps and offers regeneration services to extend strap life beyond natural wear.