There are 4 models of the Sport-king, going back to 1951...from Connecticut...Houston is a different animal, IMHO
a 1980 would be the Third Model which started in 1974, don't have the discontinued date in my book...hrm...
1st Model is 1951-58
2nd model is 1958-1970, don't know why there was a 4-year gap...
also a Lightweight aluminium alloy version made from 1954-65
I'm not just Trigger Happy, I'm Trigger Ecstatic!!