Omega
Omega Speedmaster '57 Co-Axial 41.5 331.50.42.51.02.002
The Omega Speedmaster '57 Co-Axial 41.5 (reference 331.50.42.51.02.002) is a 41.5 mm red Gold watch with a silver dial. It runs on the automatic caliber 9300.
Specifications
Case
- Reference
- 331.50.42.51.02.002
- Collection
- Speedmaster
- Case size
- 41.5 mm
- Case material
- Red Gold
- Bracelet / strap
- Bracelet
Dial and bezel
- Dial
- Silver
Movement
- Movement
- Automatic
- Caliber
- 9300
Dial versions
This reference was made with these dials and finishes.
331.50.42.51.02.002 Silver
Silver
How it compares within the Speedmaster family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 331.50.42.51.02.002 (This watch) | 41.5 mm | Red Gold | Silver | 9300 | — |
| 310.30.42.50.04.001 | 42 mm | Stainless steel | White | 3861 | 2024– |
| 310.92.44.50.06.001 | 44.25 mm | Grey ceramic | Grey (skeletonised) | 3869 | 2025– |
| 310.92.44.50.06.002 | 44.25 mm | Grey ceramic | Grey (skeletonised) | — | 2025– |
| 318.90.45.79.01.003 | 45 mm | Titanium | Black | 5622 | 2022– |
| 332.10.41.51.01.001 | 40.5 mm | Stainless steel | Black | 9906 | 2022– |
| 332.10.41.51.03.001 | 40.5 mm | Stainless steel | Blue | 9906 | 2022– |
| 522.30.38.50.04.001 | 38 mm | Stainless steel / ceramic | White | 3330 | 2025– |
| 522.30.38.50.04.002 | 38 mm | Stainless steel / ceramic | White | 3330 | 2025– |
About the Speedmaster family
The Speedmaster was introduced in 1957 as a sports chronograph with the tachymeter scale on the bezel. It passed NASA's tests in 1965 and was worn on the Moon in 1969, which is why the hand-wound Professional is known as the Moonwatch. Its movement has gone from the caliber 321 to the 861 and 1861, and in 2021 to the Master Chronometer 3861.
Around the Moonwatch the line includes the Speedmaster Racing, the ceramic Dark Side of the Moon, automatic chronographs, the smaller Speedmaster 38 and many special editions. Dealers check the caliber, the crystal (Hesalite or sapphire), the caseback engraving and the reference, and on vintage pieces look closely at dial, bezel and hands.
Quick answers
- What size is the Omega Speedmaster '57 Co-Axial 41.5 331.50.42.51.02.002?
- The Omega Speedmaster '57 Co-Axial 41.5 331.50.42.51.02.002 has a 41.5 mm case.
- What movement does the Omega Speedmaster '57 Co-Axial 41.5 331.50.42.51.02.002 use?
- It uses the automatic caliber 9300.
- What is the Omega Speedmaster '57 Co-Axial 41.5 331.50.42.51.02.002 made of?
- The case is red Gold. Bracelet or strap: Bracelet.
Catalog facts checked October 2026.