Strap for Speedmaster 57 Co-Axial Titanium / White

The lug width is 20mm. This is a specific dimension that does not allow for variations: oversized straps (22mm) will not fit into the lugs, while undersized ones (18mm) cause oscillation and instability. Correct measurement is performed with a digital caliper placed parallel to the dial, measuring the internal distance between the two shoulders of a single lug.

Vegetable-tanned alligator remains the reference choice: its natural grain enhances the case geometry, and the progressive patina of vegetable tanning is consistent with the vintage aesthetic of the model. Shell cordovan is an alternative for compactness and shine, while vegetable-dyed calf offers elasticity and moderate patina. Rubber and NATO straps remain ideal for those who prioritize practicality and reversibility.

Use a spring bar tool specifically designed for 20mm lugs. Place the watch on a soft cloth with the dial facing down. Insert the spring bar tool into the lateral grooves of the lugs from inside the case, gently compress the lateral springs of the pin, remove the old pin, and insert the new one using the same method in reverse. Avoid hammers and screwdrivers: titanium is resistant but the lugs are precision-engineered.

Yes, but they must be strictly 20mm. Milanostraps.it offers artisanal straps in alligator, calf, and rubber specifically compatible with this model. Always verify that the strap has loops (or rings) capable of accommodating the 20mm lug width: many universal straps do not guarantee this precision standard. The Casati Milano atelier also creates custom solutions with direct consultation.

Durability depends on material and frequency of use. Vegetable-tanned alligator resists 3–5 years with moderate daily wear; vegetable-dyed calf 2–3 years; shell cordovan 4–6 years due to structural compactness. The chronograph, with more intense mechanical movements compared to a simple watch, transmits micro-vibrations to the strap. Seasonal exchanges and resting the strap between wears extend its lifespan. The 18-month artisanal warranty from Casati Milano covers manufacturing defects.