Strap for Speedmaster Professional Moonphase Aventurine / Strap

The lug width is 21 millimetres. This is the inner distance between the two lugs of the case. Always verify with a digital caliper before ordering a strap, as 21 mm is not compatible with 20 mm (Rolex, Tudor) nor with 22 mm (Panerai, IWC).

Dark brown alligator (siena brown or dark tan) is the most technically appropriate choice for the Moonwatch: its regular texture combines durability, aviator elegance, and natural patina over time. Alternatively, burgundy shell cordovan ages with extraordinary dignity, while vegetable-tanned calf in terracotta tones offers greater softness and aesthetic warmth.

Position the watch on a protected surface. Use a spring bar tool or a small flathead screwdriver to apply gentle pressure beneath the lug spring. The spring retracts, freeing the pin; remove the old strap and insert the new one by aligning the hole with the pin. Compress the spring until you hear a click. Repeat for the opposite lug.

Yes, provided it is constructed for 21 mm lug width. Certified artisanal straps in alligator, calf, and shell cordovan are fully compatible. Verify that the strap is at least 115-120 mm long (lug to lug) to accommodate wrists from 16 to 22 cm with an adjustable buckle or deployant clasp.

A vegetable-tanned calf strap of artisanal quality lasts 3-5 years in daily wear before needing replacement. Alligator and shell cordovan last 5-8 years thanks to their more robust structure and superior thickness. Duration depends on environmental humidity, frequency of wear, and maintenance (annual conditioning with beeswax or mink oil).