Reverse Reverse B, the digit "0" is of an oblong shape.
Obverse Obverse 3, the awns of the ears of wheat to the left and right of the coat of arms are separate from each other, the first letters "S" and "R" are lowered relative to the coat of arms, the sun's disk lacks a rim, the USSR coat of arms has 16 ribbon turns (the number of republics in the USSR at that time).