Jaeger LeCoultre Transparent ATMOS clock, Plexiglas cabinet and columns, gilded brass base. White dial with epis markers and applied numerals. Functioning at the time of the test. 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.