Memovox Deep Sea / Deep Sea Alarm E 857 — Jaeger-LeCoultre European Version

Jaeger-LeCoultre 815

The first automaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. alarm calibreCaliberThe designation of a watch movement, identifying its design or movement family., with a bumper (limited-swing) rotorRotorAn oscillating weight that uses wrist movement to wind an automatic watch’s mainspring. because the alarm hammer strikes a pin on the caseback; the alarm still has its own barrelBarrelThe drum that contains the mainspring.. Marked K815.