With all due respect, I can't see any way an all-original 59 guitar could have a 60 date stamp on it. You could argue that all the parts MIGHT have been made in 59, but the guitar itself could not have been assembled until at least FEB 60, and that makes it a 60 model. I can't think of any way a body could get a 2/60 date stamp in the year 1959.
My take on this is that they guy has a very early 60 Strat with most parts probably made in late 59, but AT LEAST the body wasn't finished until 1960, therefore the guitar could not have been completed until then at the earliest, which makes it undeniably a 60 model (even though it may be absolutely identical to a late 59, it is still a 60). Furthermore, for some reason the guy seems to think it is cooler/more desireable to own a 59, so he knowingly stretched the truth. He knows it's a 60, but doesn't want it to be. Wilko simply told him it was a 60 because he was putting inaccurate information on the board. The guy got offended (I assume because Wilko rained on his 59 charade) and accused Wilko of being juvenile, when he was simply being accurate. When Wilko defended the accuracy of his post the guy accused him of having "mental limitations". There's no call for that - Wilko was right and the guy knew it (he knew it before he ever posted the first time, unless he just doesn't understand the calender). He was just mad because for some reason he wants to call it a 59 when he knows it isn't, and someone corrected him in public. You are quite right that the guy has a very desireable vintage guitar (assuming he didn't make it up, and I'm willing to accept that he probably isn't) which baffles me as to why he got hung up on calling it a 59. Yes, there's no difference, but it simply CAN'T be a 59. I'd sure be proud to own either a 59 or 60, and the guy is sure lucky to own his. We all know it is possible to have a 60 model made from parts all made in 59, but the opposite is simply impossible without time travel being involved.