They were printed in Paris in May 1922 but never issued as the Soviets invaded Armenia around the same time. They were then released to the European philatelic market along with reprints and other issues to cover the printing costs. They are priced by Gibbons at GBP1 each but are not catalogued. As the plates were in Paris, they were extensively reprinted for the philatelic trade.
They can also be found crudely perforated 11 1/2. A number of colours are known, some shown in this scan. They can be found surcharged in kopeks but again, these issues never saw philatelic use.
It's difficult to classify them because they were genuinely printed for postal use, but as they were never issued in this form I put them under cinderellas.

