Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 880:
1913, Alexis Mikhailovich, large die proof of 25k in black, printed on chalk-surfaced thick paper, size 37x48mm, trace of hinges, no thins, fresh and VF, proofs of 25k denomination are rare, especially in black color, Est. $750-$800, Scott #97
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