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

Russian Semi-Postal Issues

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Start price: $350

Buyer's premium:

1929, Child Welfare issue, 20+2k black brown and blue, right sheet margin single with perforation L 10¾, imperforated at right, full OG, LH, VF and very scarce, Est. $600-$700 , Sc. #B56 var