Half Dollars:
1964 and before are 90% silver
1965 through 1970 are 40% silver
Quarters:
1964 and before, are 90% silver
Dimes:
1964 and before, are 90% silver
Nickels:
I keep everything 1959 and before
1942-1945 are war-time alloy nickels (35% silver) -- mid-1942 they started making them, so some are silver alloy, some are not. The ones with the mintmark over the monticello are.
Pennies:
1958 and before are wheat pennies
With any "silver" coin roll, you can look at the reeding. The silver coins will be have silver reeding. All the modern ones will have a copper stripe.
Good luck!
