Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2

Armenia

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Start price: $400

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1922, entire letter (Communist Party Internal Correspondence) sent by registered mail from Delizhan to Karavanserai at Yelisavetgrad Gub. (now Azerbaijan), franked with a pair of thick black surcharge 2(k) on 2r slate gray, all appropriate markings, some flaws, still F/VF and rare, Est. $600-$800, Sc. #362a