Strap for Speedmaster Co-Axial White Gold / MOP / Diamond / Olympic Collection

The lug width of this model is 22mm. This dimension is determined by the geometry of the 44.20mm case and the slots cut into the lateral lugs. To verify it, measure with a digital caliper the distance between the inner walls of the two lugs: it should be exactly 22mm.

For the 321.58.44.52.55.001 we recommend a high-end alligator in dark brown or natural tones, which enhances the brilliance of white gold. A sophisticated alternative is shell cordovan, which develops a deep patina over time. For those preferring everyday versatility, a vegetable-tanned calf leather in brown or black offers comfort and an evolving patina.

The strap is replaced using a dedicated tool (spring bar tool) to compress the elastic rings (spring bars) that secure the strap to the lugs. Position the tool in the spring bar slot, compress gently and slide the strap outward. Insert the new strap by aligning the hole to the lug position and release the spring bar when fully inserted.

Yes, any 22mm strap designed for wristwatches is compatible with this Speedmaster, since compatibility is determined solely by lug width and customizable total length. Milano Straps offers 22mm straps in leather, fabric and rubber, adaptable to any wrist size.

The lifespan of a leather strap depends on use and tanning. A high-quality alligator or shell cordovan strap, with vegetable tanning, lasts an average of 3-5 years of daily use. FKM rubber and NATO fabric last longer (5-7 years), while vegetable-tanned calf leather falls at 2-4 years depending on exposure to moisture and sweat. Casati Milano guarantees 18 months on all straps made.