Atmos clock celebrates the 150th Anniversary of the invention of the Atmos clock by Jaeger-LeCoultre – Geneva. It runs on an air pressure, bellows system that captures the difference in atmospheric pressure when it goes up or down. That change in pressure is caught in the bellows and therefore has the power to run the clock. It’s the closest thing to perpetual motion that has ever been built. This clock has three feet that can be used to level it, and there is a bubble glass to show when it is perfectly level. There is a “150″ medallion and a medallion that states the number, which is 311. The clock has been refurbished in 2007 and keeps excellent time. I might adjust it twice a year for a couple of minutes. There is a manual lever to adjust the mechanism – faster or slower. The dome is blown glass crystal and looks majestic, when it covers the clock’s movement. I have an original marketing brochure but no original packing materials. I have the instructions on starting and setting the time etc. Perfect condition.