Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 134:
1926 (August 25-28), Pioneer Flight registered cover from Kursk to Moscow and then to Berlin, franked by Lenin Mourning issue, 3k-20k, imperforate complete set of four (20k – medium frame, others – large frame) and Esperanto Congress of 7k and 14k, tied by Kursk ”25.8.26” ds, sent from Kursk Division of Soviet Philatelic Society, violet etiquette with letter ”B” on reverse, Moscow ”27.8.26” transit and Berlin the same day arrival markings, VF and scarce, Est. $300-$400, Scott #265-68, 347-48
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