A special watch, perpetual, built to run for 600 years, winding mechanism, and 15 jewels, JAEGER LeCOULTRE, ATMOS 519, from 1948, nickel plated.dial color,dark blue.The watch looks and works very well. In the late 1930s, Atmos watches were manufactured in the same factory in the Jura Mountains of Switzerland by highly skilled watchmakers. The Atmos clock is powered by perpetual motion - it doesn't need to be manually wound. It gets the energy it needs to run 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 operating spring is continuously charged, being almost all the time at the maximum load limit .Will be properly packed, in 2 boxes, box in box, with proper insulation, with pendulum lock. Dimensions: height 23 cm; width 21 cm; depth 16cm; weight 4 kg .