I have a 400 day clock made by Herr, that has the suspension spring missing. I cant find any part numbers anywhere, other than the following markings:
on clock face it says Herr,
on the back of the mechanism it says:
NO (0) JEWELS
UNADJUSTED
MADE IN GERMANY
UHRENFABRIK HERR K.G.
GUTENBACH
How can I identify what spring to use? I joined a clock forum but its a bit quiet in there...

Picky