I believe the company is Star Amusement Company, Tales. Yes, I also would like to know what it does. Just randomly put up numbers? To beat the house or another player or? Or do you get a charge by pulling the coin exchanger and that is why it is called "Sparky"?
After a search, the best I could find was...Antique Mechanical Coin Operated Poker Machine, Vintage "Sparky", 5 Cents ,Counter Poker game trade stimulator, Made by Star Amusement Company