Guys,
These are made by the mint, not sure if only Moscow or both. Some variations have round Moscow mint mark on the back. Variations without the mm are slightly different and may be from Leningrad (just a guess).
2nd class is made of aluminium.
Have a look:
Here are two more variations of the 2nd class reverse:
Alexei
These are made by the mint, not sure if only Moscow or both. Some variations have round Moscow mint mark on the back. Variations without the mm are slightly different and may be from Leningrad (just a guess).
2nd class is made of aluminium.
Have a look:
Here are two more variations of the 2nd class reverse:
Alexei











