History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 486:
BLOCKS OF FOUR – GROUP: 1930-46, 12 blocks missing only No. C1 for completion, C7-9 and all Special Delivery are plate No. blocks, generally very well centering, full OG, NH, VF, Unitrade C.v. CAD$1,375++, Est. $250-$400 , Sc. #C2-9, CE1 4
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