The year 2014 marked the 50th anniversary of the first year of operation of the Germany & Colonies Philatelic Society following the amalgamation of the Germany & Colonies Stamp Club (established 1947) and the Stockton German Study Group (1960).
The G&CPS celebrated its inaugural year in 1964 with the first Germania Posta philatelic exhibition held in Stockton.
How did the Warsaw City Post operate in conjunction with the existing German Post?
How were the locals added? Did the sender have to add them before posting the letter?
If yes, how did senders from outside the area deal with this? Did they have to have the local delivery stamps? Or could they prepay?