RUSSIA. Platinum 3 Rubles, 1828-CNB. St. Petersburg Mint. Nicholas I. NGC Unc Details--Reverse Scratched. Fr-160; KM-C-177; Bit-73. The first year of issue for this engaging, fascinating, and short-lived platinum series, the present specimen does exhibit some noted marks in the fields on each side, but otherwise offers nothing in the way of handling and retains a good deal of brilliance, making for a quality representation of the type.