Gold-plated 861, 18 jewels
Speedmaster Moonwatch 3590.50 — Gold-plated 861, 18 jewels
1992–?
18-jewel 861 from 1992; the bridges still read “seventeen jewels” until 1995, when “eighteen jewels” first appears.
No verified image of this watch yet
Identifying details
- Baton hands
Straight white stick hour and minute hands, as on the Moonwatch.
- “Professional” dial
“Professional” printed under the Speedmaster name.
- Asymmetric case
Lyre-lug case with guards around the crown and pushers.
- Flight-qualified medallion caseback
Seahorse medallion with “Flight-qualified by NASA for all manned space missions” and “The first watch worn on the Moon”.
Variants of 3590.50
Reference overview →| Variant | Production |
|---|---|
| Copper-plated 861 | 1988–? |
| Gold-plated 861, 17 jewels | 1990–? |
| Gold-plated 861, 18 jewelsCurrent | 1992–? |
Case & movement
- Reference
- 3590.50
- Production
- 1992–?
- Case material
- Stainless steel
- Movement
- Manual winding
- Caliber
- Omega 861 — 18 jewels
Dial, bezel & hands
- Lume
- Tritium
Movement
Omega 861
Lemania-based hand-wound chronograph that replaced the 321 in 1968: a cam (shuttle) instead of a column wheel, a higher beat and cheaper to make. A Delrin brake replaced the steel one in the early 1970s; gold plating replaced copper around 1987–1990, and an 18th jewel was added in 1992.