Jaeger LeCoultre Atmos clock in glass and brass, openworked dial with applied hour-markers and Arabic numerals, signed, atmospheric perpetual winding movement. Functioning at the time of testing Note: The Atmos clock embodies Jaeger-LeCoultre's mastery of the perpetual movement. Perfected in 1928, its revolutionary winding mechanism is driven by the contraction and expansion of a mixture of gases. As elegant as it is timeless, the Atmos clock illustrates the exceptional skills of the Jaeger-LeCoultre craftsmen and the excellence of its Atelier des Métiers Rares. The clock is also an inexhaustible source of inspiration for generations of designers.