18 card set. This series was issued in 1979 and has dates for one show in November of 1978 and one show in April of 1979 on the back. There was a another series of 18 printed in 1979 with show dates for 1979 and 1980 that is sometimes considered an extension of this set, making a 36 card set. We are considering them as separate 18 card sets because the backs are substantially different.