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

Soviet Union Stamps of 1941-91

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Start price: $300

Buyer's premium:

1958, Astronomical Congress, 60k light blue, violet and yellow, vertical strip of three, top stamp with ”UAU” variety at the top right, full OG, NH, VF, Est. $500-$600 , Sc. #2093, var