Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 895:
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, Scott #523
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