Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 562:
1930, Mercury, 5c olive brown, bottom sheet margin block of six (2×3), bold color and nice centering, full OG, NH, VF, C.v. $600, Unitrade C.v. CAD $840++, Est. $200-$300, Sc. # C2
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