Longines 6651
Longines caliber 430 was launched in 1967 after Girard Perregaux introduced a 36.000 A/h movement in 1966 (cal: 31.5). The increased wear and lubrication issues in a 36.000 A/h movement made Longines to redesign these movements to 28.800 A/h versions, launched in 1972.
For parts to the 66XX calibers, see cal: 430.
Movement serial number: 52 072 024 (1972).
Technical data Longines cal: 6651
- 25 jewels, manual wind, sweep second, date.
- Size: 11.5''' 26.50 mm.
- H: = 4.80 mm.
- N: = 28.800 A/h.
- Power reserve: 42 h.
Versions: 36.000 A/h, 17 jewels.
- 430: base caliber.
- 431: date.
- 432: no second.
- 433: no second, date.
Versions: 28.800 A/h.
- 6641: 25 jewels, adjusted in 4 pos.
- 6642: 17 jewels.
- 6651: 25 jewels, date, adjusted in 4 pos.
- 6652: 17 jewels, date.