Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 684:
1966, UNESCO Hydrological Decade, 5f-100f, two complete sets of three, one of which with red orange color inverted, both sets are in sheets of 20 (5×4), full OG, NH, VF, Est. $200-$250, Scott #433-35, var
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