How would one know this?Is it a true magneto? Joe Hunt also sells a stand alone distributor that looks like a magneto but isn't.
I'm sorely tempted to make an offer,but I need this part like I need a hole in the head!Looks like a nice one.
See if it only has one terminal on the side,this would be the shut-off.Pick it up and with one hand turning it clock-wise,place your other hand near one of the wire sockets.If it knocks you on your butt,it even works.