Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 780:
1913, Alexander II, imperforated large die proof of 2k in black, printed on chalk-surfaced thick paper, size 39x46mm, previously hinged, no thins or other hidden defects, VF, proofs produced in black are very rare, Est. $1,400-$1,800, Scott #89
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