Swiss brand, perpetual watch, JAEGER LeCOULTRE, ATMOS, series 657893, model 540, from 1983. The watch works very well and is VERY ACCURATE, it has been revised and never rewound. The Atmos watch is powered by perpetual movement - it does not need to be wound manually. It obtains the energy necessary for operation from changes in temperature and atmospheric pressure in the environment and can operate for decades without human intervention. For a two-day operation, a temperature variation of only one degree between 15 and 30 degrees Celsius or a pressure variation of 3 mmHg is sufficient. The mainspring is continuously loaded, being almost always at the maximum load limit. Scratch-resistant sapphire crystal. It is guaranteed for 600 years of operation and has 13 rubies. Nickel-plated brass and crystal furniture. Dimensions: height 23 cm; width 21 cm; depth 16 cm. Will be properly packaged, in 2 boxes (box in box), for delivery.