The stamps issued and used during the time of the Transcaucasian Socialist Federative Soviet Republic (1922 – 1936) are interesting because the cancels of the first republic saw further uses. Also, the bolshevists did not allow private dealers or other persons to create and deal with philatelic material. They did it centrally through governmental institutions. There was no Serebrakian or Melik Pasha possible. Still I have found some stamps with seemingly CTO impressions, gum and dealer markings.
The idea is to collect stamps with republic cancels for comparison use, since there almost no forgeries of cancels during this time. Only two drawbacks: clear impressions of provincial cancels are rare (!) and forgeries of those cancels appeared on the market in the last years. I bought some from dealers in Armenia though delcampe und ebay.
While sorting through my collection I stumbled over these cancellations (see image). If you can read or identify any of them, please leave a comment.
Thanks in advance and happy hunting.
PS: Feel free to post images of your cancel fragments!