The Keystone Watch Case Co.
Keystone Watch Case Co. was the name of a conglomerate of watch companies assembled by Theophilus Zurbrugg by 1904.
Keystone purchased the rights to the E. Howard name in 1902 and sold Keystone-Howard watches.
Keystone Watch Case Co. was the name of a conglomerate of watch companies assembled by Theophilus Zurbrugg by 1904.
Keystone purchased the rights to the E. Howard name in 1902 and sold Keystone-Howard watches.