HobbyGaia - Collections - Old Mechanical Cuckoo Clock Hubert Herr,   made in Germany  (Black Forest). - Embellished with a  carousel, dancers and carrilhao music to accompany!!!, with three strings (weights), one for the clock, another for the cuckoo, and the third for the carrilhao, interesting characteristics, which together with its excellent external appearance, and its very low price,  (after a quick look inside - a complication, but apparently with all the mechanical parts present, and yet... two mountains of unknown material, blocking several parts of the mechanism:  first I thought of any intervention very badly achieved, which would be very unlikely, then  that the cuckoo had made any kind of nest, and well, it would be unlikely to  impossible, and seeing that the material was very similar to volcanic rock, that Vesuvius had made any eruption inside there!!! it's good here, not even with all Schrödinger's quantum mechanics it would be possible!!!,) I realized right away  that beautiful watch would be part of my collection!!! even lacking two weights and the pendulum,  need to restore the completely destroyed corner system - your problem  more common  - and still knowing perfectly well to have absolute  need for the  completely disassemble for  remove the two mysterious mountains, (which actually turned out to be any old insect nest)  but the  restoration/repair is  one of my favorite hobbies!!!