A rare 1950s rhodium plated Swiss Atmos Clock by Jaeger leCoultre. The lacquered “bell-jar” case is in excellent condition, with a lift off top secured on both sides.
The calibre 519 movement is stamped with the serial number 38939. It has a round silver chapter ring dial with applied dagger markers and Arabic numerals, and dagger type hands.
The silver finish of this clock contrasts beautifully with the brass wheels of the movement visible through the dial, and the blued steel screws – zoom in on the dial close-up image to see the effect.
Atmos clocks are known as perpetual motion clocks, as they require no winding. An aneroid chamber mounted on the back of the movement contains a mixture of liquid and gas which expands and contracts with movements in temperature, and this motion winds the mainspring. Even a one degree change in temperature is sufficient to wind the clock for 2 days’ duration.