John, same happened to me (twice) over the years. Funnily enough, I wanted a '68 thinking it had been Angus Young's first SG. What happened in very short time is, first I uncovered my guitar wasn't a '68 but it was a '71. One day after this - and I was in pain - I did find out Angus' first SG was a actually a '71 (wrote a lot about it). Couldn't have been happier, and still am. Right now, I almost favor more '70s and '71s than '68s and '69s. Not only for now I know the truth but also because, indeed the early '70s ones are different, very comfortable but mostly, extremely powerful and "cut-thru" guitars.