Ok. That serial number complicates things. Above it was stated that it was a 1982. Serial number is 1980.
The ST70 came out at the end of 1981 as far as I can tell.
They first show up in the spring 1982 catalog.
Not listed in the 1981 catalog (which came out in October 1980?).
It would have to have been made around that time, October 1980, or later.
Quite the mystery.
Was wondering if it might be a partscaster, but the body code looks like it’s 2=1 which is consistent with the neck code, 2=?.
Head scratcher.
Peter Mac?