Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 519:
1928, Airplane, Angels and Globe, 5c brown olive, top right corner sheet margin plate block of eight (4×2), imprint reads: ”OTTAWA No.A-1. 91 5-A”, imperforate vertically, gum soiling at left, still full OG, NH, VF and rare multiple, Unitrade C.v. CAD$3,225++, Est. $800-$1,000, Scott #C1b
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