Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1059:
1906, Nicholas II, Louis E. Mouchon typo printing die proof (essay) in black of frame only, value tablet blank, printed on chalk-surfaced thick paper, size 38x44mm, no gum as produced, VF and extremely rare, Est. $3,000-$4,000 .
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