Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1470:
1992, Flag over the Prairie, 43c multicolored, ”repellex variety” with color changing at top, three-side margin transition block of 20 (10×2, top part of a sheet) with six stamps at upper row showing blue black instead of green black color of the background, full OG, NH, VF and a spectacular item, Est.$400-$500, Scott #1359, var
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