Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 793:
1969, Youth Chess Championships of Socialist Countries, 10ch multicolored, unissued stamp, top right corner sheet margin block of four, full OG, NH, VF, C.v. $4,000 as singles, Est. $750-$800, Scott #906 fn
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