Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 694:
Description
1922, offset of black diagonal surcharge 7500r on 250r violet, block of 15 (5×3) on chalk-surfaced paper, in addition a single with inverted black blue surcharge on chalky paper and vertical pair on ordinary paper bearing three black surcharges, all with full OG, block has minor foxing, NH or LH (pair), Est. $200-$250, Scott #201, b, var
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