Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 126:
1922 (December 2-4), Deruluft Flight registered cover delivered on line Moscow-Smolensk- Kaunas-Koenigsberg-Berlin, franked by ten values (all on reverse), including red Airplane overprint on 45k green and black in block of four, tied by Moscow ”1.12.22” ds, boxed ”Mit Luftpost” in violet on front, arrival marking is on the back, minor soiling, still F/VF and scarce franking, Est. $500-$600, Scott #C1
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