Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1310:
1957, Youth Festival Emblem, 40k multicolored, perforation L12½ instead of comb 12×12½, unfolded block of four, full OG, NH, VF and scarce multiple, N. Mandrovski certificate, Est. $300-$400, Sc. # 1913 var
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