Seth Thomas No. 801 Mantel Clock Made in 1889

I repaired this Seth Thomas No. 801 mantel clock. The date June 1889 is on the back door (date code 9881F).

This mantel clock came in 3 different finishes:

  • Wood case, adamantine finish;
  • Walnut case with ash beryl veneers;
  • Oak case with French walnut veneers.

This one is the “Walnut case with ash beryl veneers.”

Movement after repair IMG_7865 IMG_7892

See more photos.

The movement is round with loop end mainsprings. It is the forerunner of the Seth Thomas No. 120 movement.

Repair job 6309. This movement has run for many years. The escape wheel teeth were worn too short, and the pallets had grooves worn in them. After some thinking and some luck, I came upon an effective repair method: The pallets are the same as those in the No. 120 and No. 124 movements. The escape wheel teeth are the same also (the wheel spokes are different, but that doesn’t matter). The arbors are different, and they are mounted in the opposite direction. I bought an old No. 124 movement, removed the pallets and escape wheel from their arbors, and mounted them on the arbors of this clock. After setting the pallet depth, the escapement worked like new! (Another repair technique would have been to make new pallets and escape wheel, which would have been time consuming (and very expensive to my customer).

I also polished the pivots and installed 7 bushings.

Here’s a video showing the pendulum arc increasing from minimum to maximum:

Reference: Seth Thomas Clocks and Movements, by Tran Duy Ly.

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  1. Hi, I repaired this clock for a customer and don’t have it in my shop anymore, sorry.

    Yours truly,


  2. Question – I’m working on this exact same model clock, but it came without the pendulum rod. Can you please tell me what the length is from the attachment point on the suspension spring to the center of the pendulum bob. Thank you!

  3. That looks like a very nice clock. After viewing the video, I have some questions about my Seth Thomas candlestick clock that I will ask you about.

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