Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 525:
Selection of Multiples, 1927-46, 11 blocks of four with premium centering, including four plate blocks for Air Mail Special Delivery and seven for Special Delivery, including Confederation 20c orange, all with full OG, NH, VF, Unitrade C.v. CAD$1,300++, Est. $200-$250, Scott #CE1-4, E3/11
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