Omega · Speedmaster Moonwatch

Strap for Speedmaster Professional Moonwatch RAID

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter42 mm
Reference311.30.42.30.01.007 (aka: 31130423001007)
FamilySpeedmaster Moonwatch
MovementOmega caliber 1861 small seconds, hours, minutes | Chronograph
Year2018
CaseStainless Steel

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Speedmaster Moonwatch 311.30.42.30.01.007 (aka: 31130423001007)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Speedmaster Moonwatch 311.30.42.30.01.007 (aka: 31130423001007), seen from the bench

The Speedmaster Moonwatch was introduced in 1957 as a professional chronograph for pilots and was later adopted by NASA for space missions. It features the manual-winding Omega caliber 1861 with chronograph, hours, minutes and small seconds functions. The case has 20mm lugs and maintains the classic proportions of the original model.

Frequently asked questions

What is the exact lug width of the Omega Speedmaster Moonwatch 311.30.42.30.01.007?

The lug width is 20mm. This dimension is determined by the distance between the two lateral pins of the case where the strap sits. In the Moonwatch this tolerance is critical: a 19mm strap could move laterally, a 21mm strap would not fit correctly into the lugs. Always verify this measurement before purchasing an aftermarket strap.

What is the best strap for the Omega Speedmaster Moonwatch?

There is no absolute 'best' – it depends on the desired aesthetic identity. Alligator with vegetable tanning represents refined luxury; shell cordovan offers visible aging patina; calf guarantees immediate comfort; NATO recalls vintage-sport charm; synthetic rubber maintains the Moonwatch in its pure instrumental dimension. The choice depends on daily use and personal aesthetics.

How to change the strap on the Omega Speedmaster Moonwatch?

The Moonwatch uses lugs with straight spring bars. Obtain a pin removal tool, position it perpendicular to the case, remove the pin from one lug only by pressing gently inward. The internal spring releases the pin and the old strap detaches. Insert the new strap into the lug, reinsert the pin by pressing until you hear the re-engagement click. Repeat on the other side. If unsure, rely on a specialized craftsman.

Are aftermarket straps compatible with the Moonwatch 311.30.42.30.01.007?

Yes, provided they respect the 20mm lug width. Any strap built for 20mm lug width is mechanically compatible. Aesthetic compatibility depends on choice of material and color: alligator, shell cordovan, calf with vegetable finishes, or artisanal NATO dialogue coherently with the Moonwatch's stylistic identity.

How long does a leather strap last on the Omega Speedmaster?

The lifespan of a leather strap depends on material and use. Quality alligator or shell cordovan, with vegetable tanning, lasts 3-5 years of daily wear; calf 2-4 years; synthetic NATO 5-8 years. Leather aging is not deterioration, but patina: the surface develops darker tones and richer texture. Professional warranties (such as Casati Milano's, 18 months) ensure coverage 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