First Series, Double Swiss · Underline Double Swiss
Cosmograph Daytona 6239 — First Series, Double Swiss · Underline Double Swiss
1963
A thin line under “Cosmograph” is read as marking the switch from radium to tritium lume. The known batch is 923,xxx; the first serials are said to start around 922,900. Grené dial surface with markers glued on.
No verified image of this watch yet
Identifying details
- Pump pushers
Plain push-piece chronograph pushers, not screwed down.
- Tachymeter bezel
Tachymeter scale engraved on the rather than the dial.
Variants of 6239
Reference overview →| Variant | Production |
|---|---|
| First Series, Double Swiss | 1963–c. 1964 |
| First Series, Double Swiss · Underline Double SwissCurrent | 1963 |
| First Series, Double Swiss · Double Swiss, No Underline | 1963 |
| First Series, Double Swiss · Double T Swiss T | 1963–1964 |
Case & movement
- Reference
- 6239
- Production
- 1963
- Case serials
- c. 922,900–923,999
- Case material
- Stainless steel
- Case diameter
- 36.5 mm
- Water resistance
- 50 m
- Crystal
- Acrylic
- Movement
- Manual winding
More specifications (2)
Movement
Valjoux 72B
Rolex designation for its early Valjoux 72-based chronograph caliber. The earliest caliber used in the Daytona, found only in very early 6239s; also recorded in the 6238 and in a 1966 6240. One editorial equates it with the 722 and dates it to 1966.
Manual winding · 17 jewels