A wide selection of used Atmos clocks is available from sellers on eBay.com as of 2015. There is a variety of models and designs from different eras, and the clocks are made from various materials.
Atmos clocks do not have external power sources, do not need to be wound by hand and are not powered by suspended weights. These clocks get power from miniscule changes in atmospheric temperature and pressure, and they can run for years without human intervention.
The first Atmos clock was designed by Jean-Leon Reutter in 1928, and as of November 2015, these clocks are manufactured by Jaeger-LeCoultre in Switzerland.