Strap for Speedmaster Professional Moonwatch 3861 Stainless Steel / White / Sapphire / Rubber

The lug width is 20mm. This measurement represents the internal space between the two lugs of the case: any strap must have exactly this dimension to fit correctly into the bracket. An incorrect measurement compromises compatibility and mounting safety.

For this chronograph we recommend vegetable-tanned alligator or burnished calf: both balance the robustness of the steel case with appropriate elegance. Alligator ages with character, developing patina; calf is versatile and durable. High-density rubber is the purely sporting choice. Avoid inexpensive synthetics that deteriorate rapidly.

Position the watch face down on a soft surface. Locate the small hole beneath the lug: insert a pin or dedicated tool to eject the mounting pin, removing the old strap. Repeat on the opposite side. Insert the new strap aligning it vertically, pressing the pin until the retention spring clicks into place. Verify it is securely fastened before wearing.

Yes. All straps catalogued in the 20mm section of milanostraps.it are compatible with the Moonwatch and with any watch featuring a 20mm lug width. They are customizable in length, embroidered initials, and stitching thread color. For specific requirements, the Casati Milano atelier creates bespoke straps with direct consultation.

A quality leather strap (artisanal alligator or calf) lasts 3-5 years with daily wear, provided periodic maintenance: protection from stagnant water, drying after perspiration, occasional treatment with natural wax. Direct sunlight exposure and prolonged humidity reduce lifespan. Rubber, conversely, lasts 5-7 years with virtually no maintenance but with less aesthetic character.