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Buy, Sell, or Trade your watch here: http://www.thewatchbox.com Tim Mosso and Mike Michaels discuss early automatic wrist watches. Mike starts by discussing one early attempt at automating the winding of a pocket watch. Later, the John Harwood bumper automatic system was industrialized by Fortis of Switzerland during the mid-1920s. Tim showcases an automatic Jaeger-LeCoultre caliber 476 bumper automatic. The Rolex "perpetual" winding system of the early 1930s is discussed; Mike notes the role of the modular Rolex rotor system in creating the "bubble" like case profile of the famed Rolex "bubble back" automatics. Video and content by Tim Mosso and Pheline Jerome.