Coin 1921 year of release

1921 marked the beginning of coinage in the USSR silver coins of various denomination. This was done in preparation for monetary reform, which began only in 1924. It is noteworthy that coins were minted with the emblem of the Russian Federation, the state emblem of the USSR appeared only in 1924.
Soviet kopek coins and the ruble is fully consistent with the Royal coins of the same denomination of the sample of silver, the size and weight. Changed only the appearance, and even then not completely. Was released such coins:
10 cents weight 1.81 grams, a diameter of 1.73 cm, rare coin;
15 cents weighing 2.7 grams, diameter 1.95 cm, rare coin;
20 cents, weighing 3.6 grams, a diameter of 2.18 cm, rare coin;
50 cents weighing 10 grams, a diameter of 2.67 cm, rare coin;
1 ruble weight of 20 grams, a diameter of 3.35 cm.
Thus, all of the penny coin, except the denomination of 1 ruble are rare because they were minted in small quantity.
In the same year in the United States was issued the last batch of silver coins – the so-called "Morgunovka dollar" denomination of 1 dollar. The coin was named after George T. Morgan who designed it design. His monogram is on the obverse of the coin.
Coin printed different mints – Philadelphia (Pennsylvania) in Denver (Colorado) and San Francisco (California). Only in 1921 were produced 86.5 million coins.
Dollar minted from silver 900-carat weighs 26.72 grams, the coin's diameter 37.9 millimeters.
In 1921, Germany had issued the coin 75 pfennings. It is noteworthy that this coin is made of ceramic.
In France, this year minted coin 1 franc, aluminum and bronze, weighing 4 grams and a diameter of 23 mm.
Italians released in 1921 coin 10 centesimi copper, with a diameter of 21 mm.