JLC 909

$Calibre JLC 909/1-440C\\ © [[Jaeger-LeCoultre]] (click to enlarge!)$
Calibre JLC 909/1-440C
© Jaeger-LeCoultre

Calibre 909 is an automatic alarm movement from Jaeger-LeCoultre.

Introduced in 2005, Calibre 909 was used in the Master Grand Réveil, a limited-edition watch. Special features included a perpetual calendar, 24 hour function, and switchable alarm on a bronze gong or just vibration.

Specifications

30 mm diameter, 8.3 mm thick
28,800 A/h
Glucydur balance, automatically compensating hairspring
Double barrel (time and alarm)
- Bidirectional automatic winding for time
- Manual winding for alarm
36 jewels
Alarm hammer on bronze gong or vibration
Power reserve of 45 hours
349 components

Jaeger-LeCoultre Alarm Calibres

Manual winding
- 1951-1958 Calibre 489 (also P489 with Parachoc shock resistance) - screwed balance, dual top plates
- 1952 Calibre 601 - transitional model, fewer than 2,000 produced, with a single top plate
- 1953-1964 Calibre 814 - improved model (also Parachoc P814 and Kif K814) - screwed balance, single top plate
- 1962-1979 Calibres 910 and 911 - 911 added a date function, solid balance, dual top plates
- 1996 Calibre 914 - manual with gong
Automatic winding
- 1956-1966 Calibre 815 - bumper automatic, 18,000 A/h; 825 adds a date function
- 1959-1969 Calibre 825 - Cal. 815 plus date function
- 1969-1983 Calibre 916 "Speedbeat" - free-turning rotor, 28,800 A/h, date, Kif only
- 1994-2008 Calibre 918 - updated 916
- 2007-present Calibre 912 - automatic, gong, 24-hour function
- 2008-present Calibre 956 - automatic, gong
Specialty calibres
- 1989 Calibre 919 - perpetual calendar and bronze gong
- 2005 Calibre 909 - selectable gong or vibration