Well, Bob's the Spanish gun expert, but I'll try. The proof you mention is a Spanish proof used since the 20's as a final proof for revolvers.
For some reason, the name Pedro Aranzabal sticks in my mind. I do know that there was a gunmaker in the Eibar region called 'Trocaola Aranzabal y Cia' who made copies of the S&W Hand Ejector in various calibers including .44 Special. Perhaps they are linked...
In any event, the quality of these S&W copies are almost uniformly poor. I would have it checked throughly by a gunsmith before attempting to shoot it.
The autonomic nervous system provides for involuntary muscle function - the work of breathing, digestion, and so forth. On some folks, that's a pure waste of ingenuity.