Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 789:
1913, Alexander I, stage proof (unclear border of the oval) of central vignette for stamp of 20k in olive green, size 38x72mm, printed on thick chalk-surfaced paper, no gum as produced, pencil ”RZ” (Rihards Zarins) initials at bottom, VF and scarce, ex- Norman Epstein, Est. $400-$500, Scott #96
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