I have a 24C that is from about the same time period. Still shoots great both as a 40 and 9mm conversion. The 22C would not fit in the "box" therefore making it ineligible for IPSIC comps at that time. The 24 C will fit if I am not mistaken. Others may know far more than I do about the two guns.
I would grab it if it were me. I love the older earlier Glocks.
Thanks! Needs a name. The trigger needs a little cleaning up. I'm gonna disassemble the trigger group and make sure everything is smooth. Not polishing anything. May just pull it all out keep it and put a skimmer or zev kit in it. But like it said, keep he original parts for originality purposes.