Hi Darryl, Nice guitar and nice rosewood. I see one of the board has corrected the date from 69 to 76. As for the signatures it really depends on what they have been written with. Naptha/lighter fluid will probably remove most of them with a little care but if they have got a good grip into the lacquer some will not go and some will shadow. If you use anything stronger than naptha you will start to remove the lacquer and all that that entails. If the lacquer is not too thin some may be buffed out. I have a feeling that the seller thinks this guitar is worth more with the signatures so maybe it will either sell high or not reach it's reserve. If you go for it then think of a price that will include all the work if you want to remove the writing and stick to it. If it has been refretted then it looks like a pretty good job from the pics.
Best wishes,Steve.