Swiss watch, Jaeger LeCoultre ATMOS 528-8, series 528688, from 1977, with 15 jewels, overhauled to date. We are in front of one of the most extraordinary objects of the horological world, and its magic lies in an almost philosophical premise: it does not need manual winding, nor 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 an assembly of 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 charge continuously, to the maximum. Theoretically, as long as the clock is in a room with temperature variations, it will work perpetually, without any manual intervention. It will be properly packaged, in 2 boxes, for transport.