Strap for Speedmaster Split-Seconds Stainless Steel / Blue / Bracelet

The lug width of the Speedmaster 3540.80.00 is precisely 20 mm. This measurement is taken in the internal space between the two lugs of the case and determines the compatibility of any aftermarket strap. Always verify this measurement before purchasing to avoid fit errors.

There is no "best" strap in absolute terms, but the choice depends on your use and personal taste. Satin alligator in cognac tones amplifies elegance, shell cordovan develops a noble patina over time, Barenia calf offers tactile softness, and NATO maintains sportiness without compromise. The professional Omega reference traditionally pairs a black alligator on a deployant clasp.

You will need a spring bar tool and a small amount of patience. Position the tool under the case lug, compress the spring bar slightly toward the inside of the case, and remove the used strap. Insert the new spring bar into the lug, ensure it is properly secured, and repeat on the other side. If you do not feel confident, consult a professional watchmaker.

Absolutely. The 20 mm width is relatively common among Swiss and international chronographs, which means access to vast catalogs of leathers, fabrics, and technical materials. On milanostraps.it you will find a complete collection of 20 mm straps ready to ship, customizable in sizes, colors, and thread stitching.

Durability depends on the tanning method, frequency of use, and climate conditions. Quality artisanal alligator or shell cordovan guarantees 3–5 years of intensive daily wear before replacement is needed; Barenia calf may degrade faster in humid environments, but ages with character. Casati Milano offers an 18-month warranty on every custom strap, covering any manufacturing defects.