From the eBay description:
This 12 1/2" tall automaton is in excellent working condition, comes fresh from an estate, with no damages, just a little tarnishing on brass cage, bird sings and moves so beautifully. The on off works perfect (some one put a little magic marker near the switch, nail polish [remover] will take it right off, I don't have any). There are no issues to report at all other than the a little dust that will need to be cleaned.
Here's the full eBay listing with many really large photographs of the K.G. Griesbaum singing bird automaton