Plymouth Clocks was a division of Seth Thomas Clock Company. This catalog from ca. 1940 shows time-only desk clocks, a windup or electric kitchen wall clock, a modern wall clock with exposed pendulum, a banjo clock, time and strike key-wound tambour mantel clocks, a round top key wind mantel clock, and a time-only electric tambour mantel clock.
1940, Plymouth Clocks, Electric and Key-Wound, "America's Greatest Values"; The Plymouth Clock; Thomaston; Conn., (ca. 1940); page 9
