What is the face value of the commemorative stamps signed by the Sino-Soviet friendship, alliance and mutual assistance treaty?

This set of stamps was issued on 1950, and the face value of the stamps is northeast currency (its exchange rate with the old RMB currency is 9.5: 1). At that time, the northeast currency and the old RMB currency were both very large (a bit like the current Vietnamese dong).

Until the currency reform in 1955, a new set of RMB was issued, and the exchange rate of the old and new RMB was 1: 10000. The face value of stamps issued during the period from 1949 to 1955 are all RMB old currency and Northeast currency.

Therefore, a stamp with a face value of 20,000 yuan is equivalent to 2 100 yuan of old currency and 0.2 1 yuan of new currency.