This Seth Thomas tambour mantel clock is 19 inches wide, 9 1/8 inches tall, and the aluminum dial has a 4.5 inch time track. The case has been refinished, and there is no label inside the rear door. It was made around the late 1920s or 1930s.
The movement is the popular and excellent No. 89, 8 day time and strike, with hour and half-hour strike on a cathedral gong.
The movement had a lot of wear. I polished the pivots and installed 14 bushings. I also straightened one bent pivot and tightened the suspension post.
The mainsprings were replacements that seemed too strong (both were 3/4 by 0.175 inch thick). I installed two thinner mainsprings to reduce future wear (especially to the mainwheel teeth). I used Timesavers part number 15959, nominally 3/4 by 0.0165 by 120 inches. The time mainspring measured 0.0162 inch thick, and the strike mainspring 0.0166 inch thick.
Repair job 5345.
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