Each item whether it is an envelope or postcard had production data on the envelope or postcard. The data on the envelopes is on the back and on the postcard it is on the front. Data included has the designer, where it was printed and the number printed.
Does anyone on this group know how to ID a TPO (travelling Post Office) or RPO (Railway Post Office) marking on the cancels of items that have been postmarked? I have read articles, but I guess one needs to be able to read, fluently, the Russian Language. Any help, what to look for, etc.? Thanks