Seth Thomas Tambour Mantel Clock with No. 120 Movement

This tambour mantel clock uses the Seth Thomas No. 120 movement, a round 8-day time and strike movement introduced in the 1920s. This movement is smaller than the more common No. 89 movement.

The clock is 20 1/8 inches wide and 8 3/4 inches tall. and has a dial of silvered brass with engraved numerals. The minute hand is 4 1/4 inches long.

See more photos.

Repair job 5725. A previous repair shop had installed bushings with unusually large outside diameter, making installing new bushings more difficult than normal. I polished the pivots after disassembling the movement, then replaced the worn bushings.

The No. 120 movement is made like a No. 124 movement but with strike only (not Westminster chime). The escapement, mainsprings and some of the gears are the same.


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  1. Hi, My question is about a case that has a ST 120 movement in it. The case is an octagon top mantel clock. I can find no others, on all of the internet?!? New Haven has one but it is not the same case. Any thoughts?
    Thank you in advance for your input. Jack.

  2. What would a mantle clock identical to this one shown that has not been restored but still works perfectly.

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