Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1809:
1906, Nicholas II, Louis E. Mouchon engraved die proof (essay) of 1r in indigo of the complete design, printed on wove paper, size 36x44mm, no gum as issued, VF and very rare, Est. $2,500-$3,000 .
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