The Polyphon 6G plays a 22 inch disc. The comb is the same as a 19 5/8 inch Polyphon but with the addition of a 2 3/8 inch bell track playing 16 saucer bells. The instrument was found in the old Alpen Rose restaurant in East Germany (after the wall came down), was restored and purchased on an EBay auction. It is coin operated using a 5 pfennig coin (a dime works also)