Metal hour tube and gear to power the hour tube. Set to replace the plastic version(s) on the ESBO / Badisch/ Herr clock works, ONLY sold as set. It is better to replace the both. The gear have a different number(s) of teeth and can therefore only be replaced as a set. The ratio of teeth is the key.
-Teeth on hour pipe 40 and on the smaller power gear it is 36 teeth on the large gear and 10 on the smaller gear.
Clockwork is shown for reference but is NOT part of the sale.