Jaeger LeCoultre, Atmos Elysée Atmos clock, brass case, champagne dial with Roman numerals and Breguet hands, Atmos movement. Working at the time of testing Note: The Atmos clock embodies Jaeger-LeCoultre's mastery of perpetual motion. 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 Jaeger-LeCoultre's craftsmen and the excellence of its Atelier des Métiers Rares. The clock is also an inexhaustible source of inspiration for generations of designers.