Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 319:
1910, King Edward VII, imperforated trial color proof of 12c in light green, left sheet margin horizontal pair printed on stamp paper, full OG, NH, VF, NSSC #88c, C.v. US $600++, Est. $200-$300, Scott #96
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