Hi guys...I have an opportunity to buy a late 60's SG standard. The guy swears it's a 68, but the headstock logo is missing the dot over the "i," leading me to believe it's a 69. All of the other features are 68...no volute, rounded heel, etc. It's had changed tuners (comes with the originals also) and is a little worn, but otherwise all original with case. Is there any definitive way to tell if it's 68 or 69? There seems to be a big difference in price between those two years. Also, any ideas of the value? I really want it, but would hate to overpay based on it being a 68. Thanks in advance!