RUSSIA. Russian Soviet Federative Socialist Republic. 15 Kopeks, 1923. Leningrad (St. Petersburg) Mint. PCGS PROOF-66. KM-Y-81. This <strong>RARE </strong>and stunningly attractive proof issue from the early Soviet Union gives beautiful luster on the specially struck surfaces that are seemingly pristine. Housed in an old PCGS holder and with a hardwood presentation box. Ex. Irving Goodman Collection.