Appeal to all philatelic experts for assistance with several questions:
- This registered cover was sent from Berlin, Germany to Harbin, Heilongjiang Province, Northeast China on 14 February 1923. What is the meaning of the purple circular postmark marked with the number 212? Is it a censorship mark? Where was it stamped and applied?
- How was the postage calculated on this cover? What was the tariff for international registered mail to China at that time, and what were the respective rates for ordinary mail and the registration fee?
- By which postal route did this registered cover arrive in China? Did it pass through the Siberian postal route? There are remnants of labels with Russian letters on the back of the cover; what do they signify?
I sincerely invite postal history experts to provide analysis and answers. Thank you very much.
My email address: czyuzhe@163.com