 In 1967/1968, Gibson changed it to join at the 19th fret.Current Gibson reissues are known at ES-330L to denote this longer ('L') feeling neck, and reissues of pre-68 330s have the 16th fret join as they would have originally.Note that the scale length of both models (16-fret and 19-fret) is the same, the body is just different (the 16-fret model has markedly taller upper bouts and thus more hollow body area).