Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 369:
1908, die proof of 7c in black, printed on India paper and mounted on sunken die card, size 78x68mm, no gum as produced, VF and rare, Green Foundation certificate, Walsh NSSC 87 dp7, C.v. US$1,500, Scott #100
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