Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 333:
1897, Maple Leaf issue, plate proofs of ½c in black and 1c in blue green, two horizontal imperforated pairs on India mounted on cards, gum as produced, VF, Unitrade C.v. CAD$580, Est. $200-$250, Scott #66-67
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