Reference Library
Keystone Watch Case Co. Case Trademark
![Keystone
Watch Case Co
J. Boss
14K
Gold Filled
[Crown & Scale] (Keystone Watch Case Co.)](/assets/images/media/Trademark-KeystoneWatchCaseCo-6.jpg)
Trademark Manufacturer:
Keystone Watch Case Co.Manufacturer Years Active:
1880 - 1956Trademark Markings:
KeystoneWatch Case Co
J. Boss
14K
Gold Filled
[Crown & Scale]
Traits:
Gold-Filled14K Gold-Filled