Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 357:
1898, imperforate plate proofs of ½c in black, 2c in carmine (Die I), 5c in blue and 8c in orange, four horizontal pairs printed on India paper and mounted on cards, no gum as produced, VF, 2c and 8c with penciled positions number, Unitrade #74P, 77P-79P, C.v. CAD $1,600++, Scott #74, 77, 79, 82
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