"Old Watchmaker Instrument - Electric Clutch - Sauter Fr System"
Here is an amazing instrument! trigger - mutually triggered by a clockwork movement that works perfectly, the electric wire had to exit through the hole at the back of the device, the dial is rotated when passing over the two letters E and D the trigger trips or snaps, probably for the opening and closing of current in an old factory or other ... movement in a beautiful cabinet of oak locking, well complete cabinet. its length is 16 cm by 12.5 cm wide for a height of 15.5 cm instrument in a superb condition. 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato