This mechanism, recently restored by Michael Start of the House of Automata, was probably fashioned by Blaise Bontems in Paris around 1890.
It’s an example of a lost art, the “singing bird box,” an early variety of automaton introduced by Pierre Jaquet-Droz in Geneva in 1784. The song is produced by a bellows, a whistle, and a system of cams; many of these devices added a mechanical bird that would flap its wings and open and shut its beak while the sound was produced.
Jaquet-Droz also created a stunning mechanical boy who writes custom texts with a quill pen; that unit, which still works, is made up of some 6,000 pieces.