Buying them are not going to do you any good to get this figured out. Just go out to some old places put your Dis. at Tinfoil and dig the hell out of the targets that are at Tinfoil to little bit below the pull tab mark. You need the corroded nickels and the nickels dug in your dirt to get this figured out. A buff is a buffalo nickel. You got to do the work. There are no stupid questions only the ones that are never asked. 40 years ago there was no one to ask you had to figure everything out for your self. HH Jerry aka Tinfoil