Boss' watch cases were the first widely adopted and commercially successful gold-filled watch cases, and are still commonly found on vintage watches today. Although James Boss certainly didn't invent the process of making rolled gold plate, Keystone 'J. James Boss, an early partner in the company that was to become the Keystone Watch Case Company, is credited with the development of the gold-filled watch case which was patented in 1859.
Here is some information on the watch curtesy of Pocket watch
