Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 835:
1906-10, proof of pre-printed stamp for stationery card of 3k in red, double impression on thin yellowish cardboard (similar to used for the issue), size 35x40mm, no gum as produced, VF and scarce, Standard Cat. #PK16, Est. $600 -$800
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