Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 680:
1965, New York World’s Fair, 50f green and violet, green frame printed on gum side with central vignette on the face, in addition trial printing of center in violet only, both in complete sheets of 20 (4×5), full OG, NH, VF, Est. $200 -$250, Scott #374 var
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