Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 972:
1908-09(c), die proof of 10k blue with design not approved for postage stamps, but very close to the design used for postal stationery cards of 3k and 4k, printed on thin cardboard, size 35x41mm, no gum as produced, VF and very rare, Est. $2,000-$3,000,Scott #79
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