A coin: one side is the image of a two-headed eagle … and the other side is 50. How much is it, please?

The coin of the Russian Federation after the disintegration of the Soviet Union has a double-headed eagle on the back with the Russian national emblem on it. The second coin from the left in the first picture is a 50-ruble coin of 1993 version, and the second picture is a 50-ruble coin of 1992 version. The modification of 1993 was mainly due to the high cost and complicated technology of bimetallic coins, so 1993 was changed to metal coins.