Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 395:
1933, Sir Humphrey Gilbert, die proof of 1c in gray black, printed on wove watermarked paper, die number ”1096” on reverse at top right, no gum as issued, VF and scarce, Minuse & Pratt #212 P1b, NSSC 195dp5, C.v. US$900, Est. $350-$400, Scott #212
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