From the eBay Listing:
The bird comes out and twirls while flapping his wings and opening/ closing his beak. When we got it to work, there was a faint tweeting noise, but I think it needs a little adjusting to work perfectly.
When you take out the drawer, the bottom says Metall [sic], and there is a mark that looks like an EB in an oval. We looked inside the top and the upper right corner says Made in Germany, and there is a little bird on top of some hills with a K on the left and and G on the right. There is also a 5 on the back of the drawer and the back of the inside near the top.
Here is a link to this German-made miniature singing bird box.