JLC 101

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The JLC 101 (also called "Calibre 2 ligne") is an extremely compact watch movement from Jaeger-LeCoultre.

Introduced in 1929, the JLC 101 is still in use today and retains its title as the world's smallest mechanical watch movement. It is legendary for its compact dimensions: Just 14 mm long, 4.8 mm wide, and 3.4 mm high, and weighs just 1 gram. Jaeger-LeCoultre is limited to making just 50 Calibre 101 movements each year due to the custom parts and special skills required.

The JLC 101 is produced in two versions:

  • JLC 101/4
  • JLC 101/4SQ

It is a hand-wound movement made up of 98 pieces designed for extremely compact applications. It runs at 21600 vph, has 19 jewels, and a power reserve of 33 hours.


Jaeger-LeCoultre currently uses this calibre in 3 watches.

External links




Hand-winding movement
98 components




L 14 mm, W 4.8 mm, H 3.4 mm
19 jewels
21600 A/h
Power reserve 33 Hours

Production period: