Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1810:
1906, Nicholas II, Louis E. Mouchon typo printing die proof (essay) in violet with face to the right, value tablet blank, printed on chalk-surfaced card, size 38x44mm, no gum as issued, VF and extremely rare, Est. $4,000-$5,000 .
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