Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 517:
1933, WIPA International Philatelic Exhibition, souvenir sheet of four 50g ultra printed on granite paper, tiny spot of natural inclusion at the top, post office fresh quality, full OG, NH, VF and scarce item with original dark gray booklet, only 10,000 sheets were printed, C.v.$3,050, ANK #556A, €4,400, Est. $1,500-$2,000, Scott #B111
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