Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 614:
1915-19, King George V, typo printing, four imperforate plate proofs of ½p in green, 2p and two of 3p in black, horizontal pairs printed on thin chalky ungummed cards or on gummed watermarked NZ and Star paper (one of 3p), NH and VF, Est. $400-$500, Scott #144, 163-64
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