RUSSIA. Duo of Kopek and 1/2 Kopek (2 Pieces), 1878-CNB. St. Petersburg Mint. Alexander II. Both PCGS MS-63 Brown Gold Shield Certified.1) Kopek. Bit-539.<p>2) 1/2 Kopek. Bit-550.<p>A great pairing, these choice issues feature intense radiance and brilliance.