Four Porcelain Children on a working music box

The children look almost like Hummels. The round box is ( I believe porcelain) also. The bottom of the box is covered with felt.

The children are all perfect condition with no cracks or breaks, the box also is in great condition.

The round box is a music box and it play London bridge is falling down"
You play the music by twisting the bottom part of the box.
The children do not move when the music plays.

Any information appreciated.