Strap for Speedmaster Moonwatch Co-Axial Stainless Steel / White / Bracelet

The lug width is 21 mm, determined by the geometry of the 44.25 mm diameter case. To verify compatibility with an aftermarket strap, measure the distance between the inner walls of the two lugs using a digital caliper, keeping the case in a horizontal position.

For this chronograph, vegetable-tanned alligator remains the noblest choice: the natural texture of the quoits dialogues elegantly with the brushed surfaces of the case. Vegetable-tanned calf offers sophistication with greater accessibility, while shell cordovan develops a cognac-colored patina over time. For sports contexts, NATO straps guarantee practicality.

Use a spring bar tool or a flat implement to gently push the pins out from the lugs. Support the case on a soft cloth to avoid scratches. Insert the new strap by aligning the holes with the pins, then push them firmly until they stop with a small 'click'. If unsure, consult a qualified watchmaker.

Yes, any strap with a 21 mm lug width is compatible. However, custom-made artisanal straps guarantee superior fit and tighter manufacturing tolerances. A tolerance of ±0.5 mm in the standard market is acceptable, but experienced craftsmen work within ±0.2 mm to eliminate lateral movement.

An alligator or shell cordovan strap with vegetable tanning lasts 4-7 years with regular maintenance and moderate daily use. Vegetable-tanned calf has a lifespan of 3-5 years. Longevity depends on exposure to moisture, heat, and mechanical stress. Artisanal Casati Milano straps include an 18-month warranty and support for regenerations and restorations.