Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia and Soviet Union - 1924 (September 18), Pioneer Flight Moscow - Berlin registered cover franked by black surcharges 5k/3r- 20k/10r, complete set of four and a single of 10k/5r on reverse, boxed ''Mit Luftpost'' and ''Mit Luftpost Befordert. Bahnpostamt 4.'' markings, Berlin ''20.9.24'' arrival ds, mostly VF, Scott #C6-9