Coin Slide. Circa 1950s, has the three (3) hole mount. This Coin Slide was the most commonly used model before WW II. It has the three (3) hole mount to fit almost every machine made to take a coin slide. When Walt Tratsch’s A.B.T. coin slide first hit the market in the early 1920s, it accepted the coin, rejected slugs and actuated the machine. Almost all the coin-op manufacturers bought A.B.T. slides for their machines.