Russia, Empire. Nicholas I CU Polushka (1/4 Kopeck). Warsaw mint, 1850. Crowned monogram / Denomination over date; crown above, B.M. below. Bitkin 878.
Graded by PCGS MS 64 BN (#26657173). Very Rare.
From the GK Collection (France) of Russian Coins;
Ex Heritage World Coin Auctions, New York Signature Sale 3031, 20 January 2014, lot 29395 (hammer: USD 710).