RUSSIA. Ruble, 1771-CNB AW. St. Petersburg Mint. Catherine II (the Great). PCGS AU-58. Dav-1684; KM-C-67A.2; Bit-211. Tied with just one other example for the finest of the date in the PCGS census, this blast white specimen is wholly without tone and offers an immense, majestic degree of shimmering luster and brilliance. From the Sigma Collection.