Omega · Speedmaster Dark Side of the Moon

Strap for Speedmaster Moonwatch Co-Axial Dark Side of the Moon Vintage Black

Takes 21 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width21 mm
Case diameter44 mm
Reference311.92.44.51.01.006 (aka: 31192445101006)
FamilySpeedmaster Dark Side of the Moon
MovementOmega caliber 9300 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel | Chronometer, Co-Axial Escapement
CaseCeramic

Recommended spring bar

Omega Spring Bars 21mm — Single Diameter

Technical match for lug width and diameter · lug 21 mm · Ø 1.8 mm

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Straps for the Speedmaster Dark Side of the Moon 311.92.44.51.01.006 (aka: 31192445101006)

Selected for the 21 mm lug width · workshop selection

All 21 mm straps →

The Speedmaster Dark Side of the Moon 311.92.44.51.01.006 (aka: 31192445101006), seen from the bench

The Speedmaster Dark Side of the Moon was introduced in 2013 as an evolution of the famous Speedmaster collection. It features the Omega 9300 Co-Axial caliber with chronometer certification, column-wheel chronograph function, and Co-Axial escapement. The case is entirely made of black ceramic with 21mm lugs.

Frequently asked questions

What is the lug width of the Omega Speedmaster Dark Side of the Moon 311.92.44.51.01.006?

The lug width is 21 millimetres. This measurement is specific to the Dark Side of the Moon and is determined by the geometry of the ceramic case with a 44.25mm diameter. Do not use 20mm straps, as they would create unwanted lateral play. Measure from the internal base of one lug to the other, perpendicular to the dial.

Which strap is best suited to the Dark Side of the Moon 311.92.44.51.01.006?

Black Nile alligator is the choice consistent with the watch's spatial identity: the textured grain dialogues with the ceramic, while absolute black amplifies the absence of reflections. For those seeking natural patina, vegetable-tanned calf develops grey-blue-black tones over time. The grey-anthracite NATO represents a contemporary alternative, reducing formal austerity while maintaining chronographic credibility.

How do you change the strap on an Omega Speedmaster Dark Side of the Moon?

The Omega Speedmaster uses straight lugs (not quick change). Proceed as follows: flip the watch over, locate the bottom of the strap, gently push the internal spring of the lugs outward with a flat tool (light spoon lever or spring bar tool). Once the spring retracts, the strap slides downward freeing the lug. Repeat on the other side. For installation, align the lugs and push the strap upward until the springs click into position. Do not use a screwdriver to force: you risk damaging the strap holder.

Are there aftermarket straps compatible with the 311.92.44.51.01.006?

Yes, exactly those with 21mm lug width. At MilanoStraps you will find a dedicated collection compatible with materials such as alligator, vegetable-tanned calf, shell cordovan and technical fabrics. Atelier Casati Milano also creates bespoke straps with personal leather selection, allowing you to choose tones, textures and stitching type for maximum harmony with the ceramic case.

How long does a leather strap last on a Speedmaster Dark Side of the Moon?

Durability depends on the material and usage. An alligator or calf of superior construction quality, worn daily, guarantees 4-6 years before significant signs of wear at the lugs. Leather develops natural patina, does not fray: intense colour and friction increase over time, creating character. Nile alligator resists environmental humidity better. All quality straps from ateliers feature 18-24 month warranties against manufacturing defects.

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.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only