1840 AD., Poland, Congress Kingdom, Nicolas I, Warsaw mint, 10 Groszy, KM C 113a.

Poland, Congress Kingdom, Nicolas (Nikolay) I, Czar of Russia as King of Poland (1825-1855), Warsaw mint, 1840 AD.,
10 Groszy (19 mm / 2,76 g), 2,90 g mint weight, billon 0,192 silver, mintage 63.349.000 ,
Obv.: M - W , crowned, Russian imperial double-eagle, M | W below. Variant with eagle's beak open.
Rev.: 10 / GROSZY / - . - / 1840 , within laurel wreath.
KM C 113a ; FIS. 023 ; Bit. 475 ; Berezowski 796 .