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This is a U.S.A. made unused Seth Thomas Tradmark Double end clock key, one side is for winding the clock up and the other is for adjusting the time.
This key will fit your antique Seth Thomas mantle or wall clock with #89 movements.
This key will not fit Seth Thomas clocks with German movements or Seth Thomas clocks that have 120, 124, or 125 stamped into the back plate of the movement. Seth Thomas clocks with German movements in them need my Hermle #7 key, and clocks that have movements stamped 120, 124, or 125 need my Seth Thomas #4/0000 key.
This key is a #6/0000
Be sure to buy from Orange County Clocks, my keys are the only ones made in the U.S.A, others are from India and the sizes are inconsistant
My keys are American original, all the brass for my keys was forged right here in the United States. Other keys you can buy are typically made in India and do not fit antique clocks.