Three matching Jahresuhrenfabrik (JUF) 400 day clocks ca. 1910 were in my shop at the same time. They have a smaller disc pendulum and thinner suspension spring than many JUF 400 day clocks, and date from around 1910.
Many JUF disc pendulum clocks use a 0.004 inch thick suspension spring, but these 3 clocks have a 0.0035 inch thick spring.
The disc pendulums are smaller in diameter than usual, but taller. They are about 2 3/4 inches in diameter, as compared to the more usual 3 1/4 to 3 3/8 inches. The pendulums have an iron core with a brass sheet spun around it, painted gold on the bottom.
Clock 1 (my number S-0634): Pendulum diameter 69.5 mm, pendulum weight 11.2 ounces.
Clock 2 (#2 in my collection): Pendulum diameter 69.5 mm, pendulum weight 10.4 ounces. I bought this clock in 1988, and restored it at that time. It still runs well and looks good!
Clock 3 (belonging to my father-in-law): Pendulum diameter 69.5 mm, pendulum weight 11.2 ounces.
All three clocks are Horolovar back plate number 1260 (having Jahresuhrenfabrik Germany G.m.b.H. in a circle around the second wheel pivot, and 2 standing elephants facing each other with a bell-top leg model alarm clock in between).
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