Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 183:
1978, Wildlife Conservation, Owls, 15c multicolored, bottom left corner sheet margin se-tenant plate No. 38800 block of six (2×3), containing block of four and pair of No. 1762-63, black and brown engraved colors are strongly shifted to the left, full OG, NH, VF and a spectacular item, Est. $150-$200, Scott #1763a var
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