Singing bird automaton - Brass - Mid 20th century

Cage with two automaton birds. from the early 20th century, I do not know if it is from earlier. When winded up (its key is present) to the maximum, one bird moves and sings, the other one does nothing. It has a crank to turn it on or off. All the stones around the base are present. The ring above is strong, it can be hung. I do not know the manufacturer, and other details of these automatons, it is the first time I have one. Acquired in an antiques market in Barcelona. By the type of key I think we know its age, and the screw is NOT a cross. https: //youtu. be/Poa. Fc. Ogrp44