Omega
Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31
The Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary (reference 3691.50.31) is a 42 mm yellow gold watch with a black dial. It runs on the manual caliber 1863 and is water resistant to 50 m. It was introduced in 1995.
Specifications
Case
- Reference
- 3691.50.31
- Collection
- Speedmaster
- Case size
- 42 mm
- Case material
- Yellow gold
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
Dial and bezel
- Dial
- Black
- Bezel
- Tachymeter
Movement
- Movement
- Manual
- Caliber
- 1863
Production
- Production
- 1995 – today (vintage)
- Limited edition
- 200 pieces
Dial versions
This reference was made with these dials and finishes.
3691.50.31 Black
Black
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 |
|---|---|---|---|---|---|
| 3691.50.31 (This watch) | 42 mm | Yellow gold | Black | 1863 | 1995– |
| 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 Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31?
- The Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31 has a 42 mm case.
- What movement does the Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31 use?
- It uses the manual caliber 1863.
- How water resistant is the Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31?
- It is water resistant to 50 metres.
- Is the Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31 still in production?
- Vintage.
- When did the Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31 come out?
- It was introduced in 1995.
- What is the Omega Speedmaster Professional Moonwatch Apollo-Soyuz 20th Anniversary 3691.50.31 made of?
- The case is yellow gold.
Catalog facts checked October 2026.