Strap for Speedmaster Professional Moonphase Aventurine / Bracelet

The Moonwatch Professional 311.30.44.32.01.001 features a lug width of 20 millimeters. This measurement is specific to the model and provides access to a vast range of aftermarket straps. To verify compliance, measure the distance between the inner lugs with a digital caliper: the result must be exactly 20mm.

Black alligator offers maximum aesthetic contrast with the tachymeter bezel, emphasizing the sports character. For daily wear, waxed calf develops a natural patina over time. If you prefer durability spanning more than a decade, opt for shell cordovan. For formal technical contexts, navy or grey NATO maintains the model's avionic heritage. Material choice depends on your primary use case.

Obtain a spring bar tool with two prongs. Position the watch securely on a soft surface, locate the spring rings beneath the lugs, gently push toward the center to release them, and slide off the old strap. Insert the new strap by aligning the holes with the spring rings, then reinsert the rings with equal pressure. Verify that the strap is firmly secured before wearing the watch.

Yes, absolutely. The 20mm lug width is an established standard, so any strap manufactured for this width is compatible. Always consult the technical specifications before purchase. Milano Straps offers 20mm leather straps in premium quality, with customization options including size, initials, and stitching thread color.

A premium leather strap—alligator, calf, or shell cordovan—typically lasts 5-8 years under normal wear conditions. Vegetable-tanned leather tends to develop a patina and visibly age after 12-18 months, without loss of functionality. Protect the strap from excessive moisture, chlorine, and aggressive chemicals. Milano Straps guarantees their straps for 18 months, with maintenance service available.