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

Belarus - Incoming Correspondences of Soviet Period

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Start price: $100

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1934, Poste Restante cover from Moscow to Minsk, franked by Baku Commissars 20k violet, Byelorussian ”Doplatsits 10к.” oval marking, since Poste Restante items had extra postal charge of 10k, machine arrival marking of Minsk, F/VF and scarce item for a postal rates specialist, Est. $150-$200, Sc. #521