Strap for Speedmaster Professional Moonwatch Apollo XI 25th White Gold Bracelet

The Speedmaster Moonwatch 3192.30.00 (alternative reference 31923000) is fitted with 20-millimetre lugs. This is measured from the centre of one spring bar to the centre of the parallel opposite spring bar. This measurement is standard across all Moonwatch versions, regardless of case material (white gold, steel or platinum).

Natural alligator leather with vegetable tanning is the ideal pairing: the soft patina of aged hide respects the elegance of the precious metal. For those seeking constructive solidity, shell cordovan offers chromatic density comparable to the weight of gold. Vulcanised natural rubber remains the technical choice for intensive use, maintaining the model's sporting vocation.

The change requires a spring bar tool. Insert the bifid end under the lug, gently compressing the spring bar to release it, then extract the old strap. The operation does not require opening the case. For less experienced owners, Casati Milano performs the replacement in the atelier in a few hours with visual case inspection.

Yes, all 20-millimetre straps in the Milanostraps collection are compatible. The Moonwatch lugs are straight and parallel, so they accommodate any strap built to ISO 23046 standard without issue. The range includes alligator, calf, shell cordovan and natural rubber.

A quality alligator or calf leather strap with vegetable tanning lasts an average of 3–5 years with daily use, provided it is not exposed to prolonged moisture. Shell cordovan, being denser leather, can reach 6–7 years. Natural ageing (patina) is desirable: premium leathers darken and acquire character over time. The Milanostraps warranty is 18 months with the possibility of maintenance at Casati Milano.