1: The 1955 Double Die Penny features a double-strike error, making the date and lettering appear doubled.
2: The 1972 Lincoln Cent has a small "D" mint mark below the date, indicating it was minted in Denver.
3: The Bison Nickel features a buffalo on the reverse side, with the buffalo appearing to have three legs.
4: The Susan B. Anthony Dollar has a hidden "S" mint mark on some coins, indicating they were minted in San Francisco.
5: The Kennedy Half Dollar features a hidden designer's initials "FG" on the reverse side near the eagle's tail feathers.
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