Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 683:
1966, UNESCO Hydrological Decade, 5f-100f, two complete sets of three, one of which with red orange color omitted, in addition proof of 25f in green only instead of green and red orange, all are in sheets of 20 (5×4), full OG, NH, VF, Est. $300-$400, Scott #433-35, var
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