Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 252:
Description
1932-37, Caribou, imperforate plate proof of 5c in deep violet, Die II, size 20.4mm, top sheet margin block of four printed on heavy wove paper, no gum as produced, NH, VF and rare multiple, NSSC #182ai, C.v. US$700 as singles, Est. $300-$350 , Scott #191
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