Here is an original Western Electric telephone mini magneto  capable of producing 100 to 120 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.

These mini magnetos were built for the U.S. military to be small yet powerful.   This magneto is as powerful as most 5 bar magnetos.

Advancement in technology allowed for stronger magnets to produce a smaller magneto while still being powerful. 

All of these magnetos will test  100-120 volts on a voltmeter . Voltage output 

will depend  on ability to  crank, your voltage output may vary.

  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.