RUSSIA. Ruble, 1770-CNB RY. St. Petersburg Mint. Catherine II (the Great). NGC Unc Details--Harshly Cleaned. Dav-1684; KM-C-67A.2; Bit-209. Despite the noted cleaning, this specimen is still uncommonly detailed and lightly circulated, making it a presentable example for more budget conscious collectors. From the Sigma Collection.