105.012-63
Speedmaster Moonwatch 105.012 — 105.012-63
Earliest and rarest; dial usually without T marks.
Identifying details
- Baton hands
Straight white stick hour and minute hands, as on the Moonwatch.
- Dot over ninety (DON)
Black “Base 500” tachymetre insert with the dot printed above the 90.
- Applied Omega logo
Raised metal Omega symbol on the dial, rather than a printed one.
- “Professional” dial
“Professional” printed under the Speedmaster name.
- Step dial
Dial with a raised step between the centre and the minute track.
- Asymmetric case
Lyre-lug case with guards around the crown and pushers.
Variants of 105.012
Reference overview →| Variant | Production |
|---|---|
| 105.012-63Current | Undated |
| 105.012-63 · 105.012, Automovil Club Peruano (ACP) | Undated |
| 105.012-64 | Undated |
| 105.012-65 | Undated |
Case & movement
- Reference
- 105.012
- Production
- Undated
- Movement serials
- c. 20.52M–20.52MLook up Omega serial numbers
- Case material
- Stainless steel
- Case diameter
- 42 mm
- Crown
- 7 mm
- Movement
- Manual winding
- Caliber
- Omega 321
Movement
Omega 321
Hand-wound column-wheel chronograph of Lemania origin (Lemania 27 CHRO C12 / 2310 family), used by Omega from 1946 to 1968 and in every Speedmaster up to the 145.012. Early examples have a symmetrical clutch bridge; later ones an asymmetrical bridge.
Manual winding · Introduced 1946 · 18,000 vph · 17 jewels · Ø 27 mm