That's an interesting ES 335, but the features don't quite add up to 1981. The coil tap, trap tail, witch hat knobs, and block neck all say pre 1981, probably 1979. It's hard to judge the nut width from the photo--could be either 1 9/16 or 1 11/16. In any case, get the serial number before deciding what year it is. Go to Charlie Gelber's excellent website, es-335.org, for some of the best info out there on vintage ES 335s.
My own Gibsons include a 1948 J-45 (owned since 1966), a '68 ES 335-12, and an '09 Nashville '59 ES 335 Historic.
Good luck.