Swiss watch, JAEGER LeCOULTRE, ATMOS II model, very rare, movement series 16432, year of manufacture 1938-39. The watch has been overhauled and works very well. The watch is two-tone.A main feature compared to the following models is the endless screw, with which the accuracy of the watch is adjusted, which was abandoned. We are in front of one of the most extraordinary pieces in the world of watchmaking, and its magic lies in an almost philosophical premise: it does not require manual winding or a battery. It is powered by changes in temperature and atmospheric pressure in the environment. The mechanism works thanks to a hermetic capsule filled with a special gas. When the temperature changes by just 1°C, the gas expands or contracts, activating a bellows that tension the spring, which makes the watch work. With that small temperature variation, the Atmos watch will accumulate enough energy to operate for two whole days. It will be continuously charged, to the maximum. Theoretically, as long as the watch is in a room with temperature variations, it will work perpetually, without any manual intervention.The watch will be packed for shipment in 2 boxes (box in box) and with the necessary protective materials.