RUSSIA. 10 Kopeks, 1880-CNB HO. St. Petersburg Mint. Alexander II. PCGS PROOF-66. KM-Y-20A.2; Bit-266. A fairly <strong>RARE</strong> issue in proof that is tied with just one other piece for the top spot in the PCGS census, this shimmering Gem presents a lightly frosted nature and some champagne-subtle rose hints sprinkled throughout.