Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Soviet Union Stamps of 1924-40

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Start price: $400

Buyer's premium:

1933, Baku Commissars, trial color perforated proof of 40k in brown, printed on paper with watermark Borders and Rosettes, perforated vertically L13¾ and imperforated at top and bottom, black crayon cancellation, full OG, previously hinged, VF, Est. $600-$800, Sc. #523