Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1036:
1928, Allegory of Flight, 5c brown olive, top right corner sheet margin plate OTTAWA No.A-1. 91 5-A block of eight (4×2) imperforate vertically, gum overflow at left, still full OG, NH, VF and rare multiple, Unitrade C.v. CAD $3,225++, Scott #C1b
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