Strap for Speedmaster Racing Master Co-Axial Stainless Steel / White / Alligator

The lug width of this model is exactly 21 mm. It is important to measure it with precision between the case lugs (spring bar) using a transparent ruler, as this dimension does not coincide with the standard 20 mm or 22 mm. A miscalibrated strap will result in a loose or incompatible fit.

For a brushed stainless steel case of 44.25 mm with black dial, we recommend black alligator (vertical grain), vegetable-tanned calf in earth tones (brown, tobacco, cognac) or shell cordovan that elegantly complements the brushed finish. The choice depends on use: formal (black alligator), versatile (brown calf), sporty (nato or rubber).

The watch is equipped with threaded spring bars. Obtain a spring bar tool with a fork, position the tip in the lower groove of the lug and gently push upward to release the old strap. Insert the new strap by aligning the holes with the lugs, then press downward until you hear the locking click. If in doubt, the Casati Milano atelier offers assistance by appointment.

Yes, provided the lug width is strictly 21 mm. Custom straps from milanostraps.it are compatible with your model and can be personalized in leather, length, initials and stitching thread. Always verify with the seller that the strap is designed for this width.

Durability depends on material, use and maintenance. Alligator has an average lifespan of 3-5 years with ordinary care (avoid prolonged moisture and contact with cosmetics). Vegetable-tanned calf ages beautifully even beyond 5 years if cared for; shell cordovan reaches 7+ years. Casati Milano straps include an 18-month warranty. Monthly cleaning with a dry cloth and occasional lubrication extend durability.