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How to Identify a Vintage Thomas Mantel Pendulum Clock

Seth Thomas began producing mantel clocks at his Connecticut factory in 1817. Pendulums regulated spring-wound clocks through the early 1900s, but are not always visible unless peering into the mechanism. Style, materials used, and marks identify these vintage mantel pendulum clocks.
  1. Styles and Design

    • Cases with pillars and scrolling echoed the popular French-style mantel clock. Resembling an S-curve in profile, simpler Ogee cases were also featured. Rectangular mantel clocks (measuring approximately 26 by15 1/2 by 4 1/2 inches) had the clock face at the top and a decorated glass panel at the bottom. On the dial were two small winding holes and dotted minute marks surrounded by one or two lines, two on earlier models.

    Construction Materials

    • The clocks utilized wood for movement and case until brass movements replaced wood in 1842. Dials were ceramic or metal and often decorated. For casings, Thomas used etched or painted paned or beveled glass, as well as enameled iron and enameled, veneered and gilded wood. The company also used an exclusive celluloid veneer called adamantine to simulate marble, wood and onyx.

    Marks and Labels

    • The trademark initials "S" and "T," written in either Old English or plain upper-case letters, sit within a diamond, surrounded by a circle. The Seth Thomas name or logo is imprinted on metal inside or printed on the dial. In addition, paper labels and stamped dates can be located on the bottom or back of the clock.


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