A coil is just a spool of wire of a certain gauge for a # of turns.... for instance, what's the difference between a 23-800 (800 turns of 23 ga. wire), and 23-800 50v? (800 turns of 23 ga. wire)..... nothing.
You're burn it out quicker at higher voltages for sure if you put full on for long pulses.
The games it would have come out of would have been 24v (ac), 50v DC, 28vdc, or 50vdc.
The usual way to test a coil is to take a resistance measurement of it and compare to pinball medic's chart (also at flippers.com IIRC) - not hook it up to power. Resistance of coils is usually relatively low and is seen almost as a dead short (<20 ohms)
