History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 490:
UNIT 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. is over CAD$1,300, Est. $200-$300 , Sc. #CE1-4, E3/11
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