Since we're talking from 1955-1981 it was fairly boring. Those nickels are unsearached for varieties at least by me.
1964 - so called XWL (extra water line) making what appears to be four water lines below KG in front of the beaver - some value in higher grades
1965- large bead variety (this is valuable in all grades more or less, not millions )
1977- low seven- some value in higher grades