Stock 1965 paint would be baked on enamel, not lacquer - lacquer was what the show car guys used back then - 10 foot deep finish, but cracked/crazed and/or yellowed over time
The baked enamel lasted really well, but it was 'hard' - that's why door dings used to be chips - the metal was stiff, the paint was hard, so the paint would crack and flake off. Now the metal is soft and the paint is flexible, so it takes more to get the paint to chip off, but the thin metal dings easily (and can be 'paintless dent repair'ed now)
