Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1068:
1913, Alexander II, die proof of 2k in black, printed on chalk-surfaced thick paper, size 39x46mm, previously hinged, no thins or other hidden defects, VF and rare, proofs produced in black were issued in very limited quantity, Est. $900-$1,000, Scott #89
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