Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 878:
1884, imperforate proof of 50c in black, bottom margin single printed on both sides (upside down on reverse) of gray granite paper, no gum as produced, minor soiling, still VF and very rare, pencil signed by P. Scheller, Est. $200-$300, Scott #J12
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