They have been introduced by the Soviet and Russian Federation governmental organs and agencies and reflected in alteration of stamp denominations.
Change of postage rates is an important aspect in studying the Russian postal history and collecting its items.
Alteration of the postage rates led to the increases in the face value of the stamps as reflected in the numbers printed and overcharged.
The rates for international postage were established by the same People's Commissariat for Posts and Telegraphs, later superseding by the Ministry of Communications of the USSR.
Following the RSFSR practice, there was a special supplementary rate in case of registered mail that was added to the normal postage charge.