Swiss watch, Jaeger LeCoultre TUXEDO, ATMOS 522, series 64986, from 1950, with 15 jewels, revised to date. We are in front of one of the most extraordinary pieces in the world of horology, and its magic lies in an almost philosophical primary: it does not need to be wound manually, nor by a battery. It is powered by changes in temperature and atmospheric pressure in the environment. The mechanism works thanks to a sealed capsule filled with a special gas. When the temperature changes by just 1°C, the gas expands or contracts, activating a small expandable compartment that tensiones the spring, making the watch work. With that small temperature variation, the Atmos watch will accumulate enough energy to operate for two whole days. It will charge continuously, to the maximum. Theoretically, as long as the watch is in a room with temperature variations, it will work perpetually, without manual intervention. For collectors, watch enthusiasts, having an Atmos means having a living object at home that breathes with us. Please look carefully at the photos! They are part of the description. It will be properly packaged, in 2 boxes, for shipping.