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Speedmaster Moonwatch 42 mm, steel on leather strap - 3873.50.31 - Image 1

Speedmaster Moonwatch 42 mm, steel on leather strap

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The OMEGA Speedmaster is one of OMEGA’s most iconic timepieces. Having been a part of all six lunar missions, the legendary Speedmaster is an impressive representation of the brand’s adventurous pioneering spirit.

This OMEGA Speedmaster Professional “Moonwatch” features a black dial covered by a scratch-resistant sapphire crystal and graced by a small seconds sub-dial, 30-minute recorder and 12-hour recorder along with a central chronograph hand. The black bezel, with its tachymetric scale, is mounted on a 42 mm stainless steel case and presented on a black leather strap.

At the heart of this chronograph is OMEGA’s mechanical calibre 1863, the famous manual-winding movement used on the Moon, visible through the transparent caseback.

Reference
3873.50.31
Between lugs
20 mm
Lug‑to‑lug
48.2 mm
Thickness
13.5 mm
Case diameter
42 mm
Case
Steel
Dial colour
Black
Crystal
Domed anti‑reflective, scratch‑resistant sapphire crystal
Water resistance
5 bar (50 metres / 167 feet)
Watch size
Gents
Total product weight (approx.)
157 g
Calibre
Omega 1863
Movement Type
Manual‑winding
Power reserve
48 hours
Strap color
Black
Strap type
Leather strap
Strap surface
Alligator leather
Strap underside
Non‑grained calf leather
Buckle type
Foldover clasp
Buckle material
Stainless steel

Key materials

  • Material - Stainless Steel

    Stainless Steel

  • Material - Sapphire Crystal

    Sapphire Crystal

Stainless Steel

Stainless steel is certainly the most conventional of watchmaking materials for outer craftsmanship, and offers beauty, strength and affordability. OMEGA uses 316L stainless steel. Known for its corrosion-resistance and high lustre after polishing, this material is often the ideal choice for watches in both daily-use and high-stress situations such as diving and adventure.

Sapphire Crystal

To really appreciate the finer details of a timepiece, OMEGA uses synthetic sapphire crystal with a highly scratch-resistant and anti-reflective treatment. Before the machining and finishing processes take place, the sapphire crystals are produced under the Verneuil process, also called flame fusion. It involves the melting of the raw substance using oxyhydrogen flame and the crystallisation of the melted droplets to form a cylinder. Graded 9 on the Mohs-hardness scale (graded 1-10), the resulting sapphire crystals are virtually scratch-proof and very hard, ensuring an unhindered vision at all times.

Movement Calibre OMEGA 1863

Calibre 1863

Famous manual-winding chronograph movement. A descendent of the calibre that was worn on the Moon. Rhodium-plated finish.

  • Manual-winding
  • 48 hours Power reserve
  • Frequency 3 Hz
Calibre 1863