Omega · Speedmaster Moonwatch
Strap for Speedmaster Professional Moonwatch 3861 Stainless Steel / Black / Sapphire / Calf
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Recommended spring bar
Straps for the Speedmaster Moonwatch 310.32.42.50.01.002 (aka: 31032425001002, 7612586306778)
Selected for the 20 mm lug width · workshop selection
Black Alligator Strap with Light Blue Edges€149
Red Alligator Strap Water Resistant€195
Green Rubberized Alligator Strap with Ecru Tribal Stitching€149
Hammered Calfskin Strap Light Blue€98
Vintage Olive Green Calf Leather Watch Strap€80
The Speedmaster Moonwatch 310.32.42.50.01.002 (aka: 31032425001002, 7612586306778), seen from the bench
Frequently asked questions
What lug width does the Omega Speedmaster Moonwatch 310.32.42.50.01.002 have?
The Omega Speedmaster Moonwatch 310.32.42.50.01.002 features a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of 20 millimetres. This specification is critical when selecting any replacement strap: 20mm lugs are not interchangeable with 18mm or 22mm models. Always verify the reference on the case between the two lugs before purchasing a strap.
Which strap material is most suitable for this Speedmaster?
For the 310.32.42.50.01.002, three materials are preferred. <a href="/pages/termine-glossario/alligatore">Alligator</a> leather with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> enhances formal elegance without weighing down the wrist; <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> develops a natural patina and longevity exceeding ten years; NATO fabric conveys the Moonwatch's military heritage. The choice depends on use: chronograph for formal occasions on leather, challenge and sports watch on NATO.
How do I change the strap on my Speedmaster Moonwatch 310.32.42.50.01.002?
Strap replacement is achieved by removing the lug pins (spring bars) using a dedicated spring bar tool. Position the watch on a soft cloth, locate the small hole beneath each lug, insert the blunt tip of the tool and gently pull the pin downward. Once both lugs are freed, the strap slides off. Repeat the reverse procedure with the new strap, ensuring the pins are centred and locked in position. If inexperienced, Casati Milano offers professional strap-changing service with warranty.
Is there a genuine aftermarket strap truly compatible with the 310.32.42.50.01.002?
Yes, provided it is certified for 20mm lug width. Milanostraps.it offers a collection of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-20mm">20mm straps</a> in vegetable leather, alligator, calf and fabric, with standard spring bars suitable for the Speedmaster. Compatibility is guaranteed by conformity of lug width; however, we recommend selecting straps with thickness consistent with the case profile (3-4mm finished leather) for authentic aesthetic harmony.
How long does a leather strap last on a chronograph like this Speedmaster?
A quality leather strap—made from vegetable-tanned or alligator leather—typically lasts between 4 and 7 years with daily wear, and up to 15 years with occasional use. Longevity depends on UV exposure, ambient humidity, frequency of wear and initial tanning quality. Shell cordovan, thanks to the fibrous structure of the horse's shoulder, reaches even 20 years while maintaining elasticity. Casati Milano straps include an 18-month warranty and professional re-dyeing and stitching service within 5 years of purchase.
The next step
The right strap isn't chosen. It is built, together.
From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only