JLC 916

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Calibre 916 (branded "Speedbeat") was an automatic alarm movement from Jaeger-LeCoultre.

Introduced in 1969, Calibres 916 replaced Calibres 815 and 825 in the Jaeger-LeCoultre Memovox range. This calibre went out of production in 1978 but was eventually replaced by Calibre 919, introduced in 1994. A total of 7,731 watches were produced with Calibre 916.

There were two notable features of Calibre 916:

  • It was the first Jaeger-LeCoultre alarm calibre to use a high-speed 28,800 A/h balance, giving improved precision.
  • It was the first ever automatic alarm watch with a free-rotating rotor, as opposed to the bumper movements produced previously.

As in other Jaeger-LeCoultre alarm calibres, the alarm hammer struck a protuberance on the back plate, making a distinctive buzzing sound. Even if the alarm was not wound, the hammer rattled freely against the protuberance. In Calibre 916, this protuberance fits through an extra-wide hole in the center of the rotor.

Variants

The Jaeger-LeCoultre Calibre 916 was used as an ebauche by Girard Perregaux, becoming the GP 080 Gyromatic alarm.

Specifications

  • 13 lignes in diameter
  • Glucydur balance, automatically compensating flat hairspring
  • 28,800 A/h
  • Double barrel (time and alarm)
    • Bidirectional automatic winding for time
    • Manual winding for alarm
  • Direct sweep central seconds
  • 27 jewels
  • Alarm hammer inside case back

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
  • Specialty calibres

External Links