Find this beautiful thing coin roll hunting. I know that 1950-1965 proof nickels don't have a mintmark. I'm thinking this is a proof. Any input?
The only coins in sets were the SMS - Special Mint Sets which were just reasonably polished newer dies that would not qualify as proofs. The mint had a created "emergency" from 1964 until 1967 in which no proofs after 1964 were minted - only the SMS coins. I got an SMS quarter from 1965 at the bank a couple of years ago.