Jahresuhrenfabrik 400 Day Clocks with Smaller Disc Pendulum

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.

IMG_2946IMG_2965IMG_2947

IMG_2953
Horolovar back plate number 1260.
Pendulum 69.5 mm diameter, 10.4 ounces, iron core with brass cover spun over it.
Pendulum 69.5 mm diameter, 10.4 ounces, iron core with brass cover spun over it.
IMG_2953 - Version 2
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

 

Data:

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).

See more photos:

Clock 1

Clock 2

Clock 3


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3 comments

  1. Update:
    I fitted a 0.0035 Horolovar suspension spring, with an overall length to put the bottom of the pendulum within 1/4″ of the clock base, and so far it’s running well and within built-in regulation/adjustment range.
    Passmore (and my early Terwilliger) seem to have missed this size/weight of pendulum.

  2. I’ve just obtained a JUF with matching backplate and pendulum numbers (125336). No circles or elephants.
    Using Passmore as a guide I fitted a 0.004″ suspension wire and it goes way too fast to adjust to timekeeping.
    The pendulum is 71.5mm diameter, and weighs 306g (10.79oz). I thought it was missing 60g as Passmore states weight is 370/380g…..
    Searching for clues, I came across this article, which has given me hope that all I need try is a 0.0035 spring, so thanks !

  3. I have a Jahresuhren-Fabrik G.m.b.H. I haven’t found one online that quite matches mine. Some major differences that I see are as follows :
    • the face just says Germany – not made in Germany
    • the pendulum weighs 12.70 oz
    • the double elephants are not directly under the name- they are almost centered on the very bottom of the backplate, while the JUF name is off center and to the right
    • the inside front plate has an 8 to the left and a 47 centered. Can you shed any light on this clocks age?

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