Thanks!
according to this website (this one TGR) on the dating fender copies section it says ST80 serial number should be 4 digits
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This information is from the 1982 Catalog.
Year Copied Tokai Model Serial Number Scheme*
1948~1954 Model
3 or 4 digits on bridge plate TE80
1954~Pre-1956 Model
4 digits on neck plates ST80, 100, 120
TE80,120 Serial Number 4 digits
1956~1960 Model
5 digits on neck plates ST50, 60
TE50, 70
PB80 Serial Number 5 digits
1960~1964 Model
L+5 digits on neck plates ST50R, 60R, 70R, 80R, 100R, 120R
TE50R, 70R, 80R, 120R
PB70R, 80R JB45R, 60R, 80R, 85FLR, 120R Serial Number L+5 digits
1965/1965~1976 Model
6 digits on neck plates ST70, SS60/60R
TE200R
PB40/40R, 48/48R, 60/60R, 70 Serial Number 6 digits
1976 Model
7 digits on headstock SS60/60R 7 digits on headstock
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whats going on there then?