On 31 March Royal Mail will issue new definitive stamps in advance of the change in postage rates which takes effect from 6 April.
Four new Machin definitives will be issued:
Of course these colours are Royal Mail descriptions so we can't be sure what they will actually look like until they show us, but the 17p is probably similar to the 18p & 30p, the 22p similar to the old 16p, red has been used a number of times (8p, 26p) and ultramarine is probably the 20½p blue.
New 56p and 90p country definitives will replace the 50p and 81p in existing designs.
Recycling in the RSFSR - Click on Images to Magnify Here is a March 1923 commercial registered cover from Petrograd to Berlin, the stamps cancelled with an oval railway station ...