Omega · Speedmaster Moonwatch
Strap for Speedmaster Professional Moonwatch 3861 Canopus Gold - Baguette / Silver - Diamond / Bracelet
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 310.55.42.50.52.004 (aka: 31055425052004)
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 310.55.42.50.52.004 (aka: 31055425052004), seen from the bench
Frequently asked questions
What is the lug width of the Omega Speedmaster Moonwatch Professional 310.55.42.50.52.004?
The <a href="/pages/termine-glossario/misura-ansa">lug width</a> of this model is 20 millimetres. This width is precise and non-negotiable: any compatible strap must have extremities (called lugs or spring bars) exactly 20mm wide to fit correctly into the case holes without play or forcing.
What is the best strap for the Speedmaster Moonwatch Professional in white gold?
For white gold, we recommend <a href="/pages/termine-glossario/alligatore">alligator</a> or calf in dark shades (black, dark brown, deep blue). <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a> with a patinated finish in burgundy or black represents a striking alternative, as it develops a natural patina that beautifully complements the luminosity of white metal. For sports contexts, FKM rubber or anthracite grey NATO maintain the functional efficiency of the watch.
How do I change the strap on my Speedmaster Moonwatch 310.55.42.50.52.004?
The replacement requires a specific tool (spring bar tool) and a few minutes of attention. Position the watch on the protective support, locate the small side holes (one on each side) where the spring bar resides, gently insert the tool into the lower hole to compress the spring, remove the old strap and insert the new one ensuring that the metal pin is perfectly seated. Casati Milano atelier offers free telephone support for this operation.
Is an aftermarket 20mm strap truly compatible with the Speedmaster Moonwatch Professional?
Yes, provided it is certified for <a href="/pages/termine-glossario/misura-ansa">lug width</a> 20mm. Many universal straps are not suitable because they have inadequate construction tolerances. Our straps on milanostraps.it are tested for full compatibility with Speedmaster cases, with reinforced lugs and precisely dimensioned spring bars. We still recommend verifying that the front lug has no excessive play upon first insertion.
What is the average lifespan of a leather strap on a watch like the Speedmaster?
A quality leather strap, subjected to daily wear, lasts between 18 and 36 months depending on <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> or synthetic tanning and the rate of exposure to humidity, direct sunlight and thermal variations. <a href="/pages/termine-glossario/shell-cordovan">Shell cordovan</a> settles after 6 months and can last over 48 months. Straps made by Casati Milano include an 18-month warranty against manufacturing defects, while natural leather wear is physiological and characteristic.
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