Jaeger LeCoultre Atmos perpetual motion (self winding) clock, caliber 528-8, serial number 381469, made in 1972. Good running condition, keeps accurate time (+/-5min.per week), the movement is in good condition, recently cleaned, bellows inspected, works good,. Case condition is good, except that base front is engraved with previuos owner name (I hide it attaching brass plate). See pictures and video for more details https://youtu.be/sl8GaeJc4HM Secure double boxed packing, "from door todoor " courier delivery service (DPD, Fedex,GLS,). Jaeger LeCoultre's famous 'Atmos' clock was first developed in 1928. "JLC ATMOS clock is one of the world’s most innovative clocks, the Jaeger-LeCoultre Atmos is a visionary technical masterpiece. Powered by atmospheric pressure and temperature changes, it’s essentially a perpetual motion device, allowing it to run for years without human intervention. The Atmos is such a ground-breaking creation that it’s chosen as a traditional gift to heads of state and dignitaries". A change in temperature of one degree can provide enough power to run theclock for few days, and the mainspring has enough power in reserve torun the clock for a year. Energy is conserved by the very slow-moving twisting pendulum which 'beats' only twiceperminute. The movement is very silent. Warning!!! These clocks can have troubles to wind inpremises with high quality climate control systems (where air temperature is very stable).