CK2998-3
Speedmaster Pre-Professional CK2998 — CK2998-3
1960–1961
Changes the dial and hands: longer markers, lower “Swiss Made” (A5-type dial) and a black Base 500 “dot over ninety” bezel.
Identifying details
- Alpha hands
Tapered, leaf-shaped hour and minute hands.
- 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.
Variants of CK2998
Reference overview →| Variant | Production |
|---|---|
| CK2998-1 | 1959–1960 |
| CK2998-1 · CK2998-1, Lollipop Chronograph Hand | Undated |
| CK2998-1 · CK2998-1, Pulsometer Bezel | Undated |
| CK2998-2 | 1960 |
Case & movement
- Reference
- CK2998
- Production
- 1960–1961
- Movement serials
- c. 17.76M–17.77M
- Case material
- Stainless steel
- Case diameter
- 39.7 mm
- Crown
- 7 mm
- Crown guards
- None
- Movement
- Manual winding
More specifications (1)
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