Yes I have several from that time including the 74 state game, both Marathon and Cherokee copies of it in fact.
the 1975 state game is the one no one has or cant find or doesnt want to admit they have for whatever reason
Having been doing this for 10 years+ Id say of the state games the 1979 State game would be the Holy Grail bc it is very likely it was never filmed at all...75 and 79 are the only state games that have never turned up