Unlike other Bally electronic pinball games, their documentation for this game shows the model number only as 1220, not 1220-E. First game from this manufacturer to use wedge sockets and #555 bulbs in production. Bally had tested wedge sockets using #444 bulbs on a small portion of the production run of an earlier game, Bally's 1978 'The Six Million Dollar Man'. Roughly 400 of the first games produced had white pop bumper caps and bodies instead of the more familiar golden ones. Pictured here is a game with serial number 1394 having these white pop bumpers. Some of the first games had plastic playfields. The one pictured here is serial number 1007. It has the white pop bumper bodies but its bumper caps were replaced with the later version. This game was very successful, and was produced again as Model 0B87, Bally Midway's 1984 'Eight Ball Deluxe'.