Unique and dramatic NO YEAR MULE MINT ERROR coin.
2013(M) 10 roubles Stalingrad rev muled with regular 10 roubles rev. Hence, no date.
Mule of obverse of standard issue 2013 10 roubles with reverse of jubilee issue 2013 10 roubles ("70th Anniversary of Stalingrad battle"). Diameter 22.00mm, weight 5.68g. Moscow mint. Presumed unique.
Please see the last image collage, showing the evolution of this amazing mule coin.
I have a unique collection of Russian mint error coins, which I will be slowly listing here...