Pocket Watch Database
Initial Marking: J. Boss
Years of Operation: 1860-1864
Successor: John G. Stuckert
The J. Boss patents and trademarks were purchased by the Keystone Watch Company and used in production by that company for many decades.
Note: This chart is not intended to be a comprehensive list of grades. Some grades changed traits over time and other grades may not be listed. This chart will be improved as additional information is studied.