Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Soviet Union 1923-91

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Start price: $400

Buyer's premium:

1979, COMECON, 16k multicolored, recalled stamp without Arms (red spot) on Bulgarian Flag, as well as three unsuccessful attempts to correct the stamp – red spot 10mm higher, 1mm to top right or 1mm to bottom left, all are in top right corner sheet margin blocks of four, full OG, NH, VF and interesting specialist unit, Est. $750- $800, Scott #4759 var