Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 462:
Description
1922, 50r violet, 100r deep red, 250r green and 25r blue, complete set of four plate proofs (issued colors), printed on white wove paper (three on wove vertically laid paper), no gum as issued, NH, VF, Est. $250-$300, Scott #B1-4
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