Strap for Speedmaster Professional Moonphase / Strap

The Omega Speedmaster Moonwatch 3876.50.31 features a lug width of 20mm, measured from center to center of the attachment holes on the case. This width is specific to the professional 42mm models and is the exact parameter for selecting compatible straps without error.

There is no single 'best' strap in absolute terms, but rather different choices depending on use: a black alligator with vegetable tanning offers elegance and durability, a fluoroelastomer rubber strap maintains the instrumental character, an Italian calf guarantees everyday comfort. The choice depends on context and personal preferences.

Use a spring bar tool to remove the pins that secure the strap to the case lugs. Insert the tool tip into the small lateral hole of the pin, pull gently, and the strap will detach. To mount the new strap, align the eyelets and press the pin until it clicks into place.

Yes, any strap with a 20mm lug width is mechanically compatible with the 3876.50.31. MilanoStraps offers a complete collection of 20mm straps in various materials (alligator, calf, rubber, NATO) already optimized for this reference.

A quality vegetable-tanned leather strap (alligator or calf) lasts 3-5 years with moderate use and regular maintenance. Direct exposure to sunlight, moisture, and perspiration accelerates aging. A rubber strap has a longer lifespan (7-10 years), while a luxury leather strap can last even longer with proper care.