Here is an original   telephone mini magneto  capable of producing 70 -90 volts. Trust me I know as I accidentally zapped myself.  These are close new old stock and some might be new old stock.  These had very little use if any. These are made much better than the larger older magnetos and the magnets are stronger.

You get an original   telephone magneto crank. These are about 3" tall and about 3" 1/4 long. You could use them in any wooden phone or magneto box whether its Stromberg Carlson Kellogg or Western Electric. You would have to place wood and shims to get it at the right height. 

 Or you could use them for your experiments or latest science project. 

 Comes with a brass folding brass crank handle are now left  These are really neat.