Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 613:
1915, King George V, engraved printing, four imperforate plate proofs of 2c, 3c, 6c and 8c in black, engraved printing, horizontal pairs on wove paper or on paper with inverted NZ and Star watermark (8c), no gum as produced, NH, VF, Est. $400-$500, Scott #146/56
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