The major American clock companies made tambour mantel clocks starting early in the 20th century. This example by Gilbert (Wm. L. Gilbert Clock Corp., Winsted, Conn.) is from the 1920s, and has an aluminum dial with embossed and painted numerals, and printed time track. The case is 20 1/16 inches wide and 9 3/4 inches tall. The dial’s minute track is 5 3/8 inch outside diameter. It is an 8-day clock (made to be wound once per week), and it does bim-bam striking every hour on two chime rods, and a single strike on one chime rod on the half hour.
Many Gilbert clocks from the early 20th century have the year of manufacture stamped on the movement (the last two digits of the year), but this one doesn’t.
Repair job 6866. The pinion on the center arbor (often called the cannon pinion) was loose because it was split. I drilled a hole though the pinion and arbor and inserted a pin to secure the pinion. I made a new warning lever return spring, polished the pivots and installed 16 bushings.
This clock has unusually thin mainsprings, yet the clock has plenty of power to run. American antique clocks like this often have mainspring that are 0.017 inch thick or thicker. This one has the following thickness mainsprings:
- Time mainspring 0.0155 inch thick
- Strike mainspring 0.0150 inch thick
I can’t tell if these mainspring are original or not, but they run the clock well.
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