one-sided proof
A coin minted by normal proofing techniques except that the rev. die remained unpolished; obv. has mirrorlike field, rev. hasn't. Such coins occur occasionally 1817-36 and more rarely later.
Source: Breen Encyclopedia
A coin minted by normal proofing techniques except that the rev. die remained unpolished; obv. has mirrorlike field, rev. hasn't. Such coins occur occasionally 1817-36 and more rarely later.