I agree that a dent is a value killer, however , that ding is non structural and hardly noticeable. If you are planning a repaint any way and it would allow you to enjoy riding a bike that you want , then work something out that would make the deal fair. Your 1975 is obviously a more valuable bike even though a repaint and you have a pretty good knowledge of these bikes so I am sure you could come up with a deal that would work. I just had my bike repainted by a good shop (Franklin) and it was less than 600 but with shipping almost 750. It came out beautiful and I can’t wait to ride it. The value of a bike, to me, is what pleasure I get from riding it. I rode my Colnago for almost a year in its patina state and loved it but wanted it to look as nice as it rode. It will not be any different in ride quality but it will make me happy to have it look new, that’s what counts for me. I ain’t in it for $ value.