need help identifying epiphone guitar

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: i have an epiphone special sg that i bought in the early eighties brand new. all were made in japan or korea at that time, yet it says made in usa all over. not just usa, made in usa. (i was told some say usa, not actually using the words "made in", which would lead one to believe it was made in usa, but this actually says "made in usa"). i was thinking maybe i got hold of a special prototype or sample that was actually made in the usa. can anybody look this up? the serial number is: 82762515 : thank you!!