History of Aviation, Rare Stamps and Postal History of the World, Part 2
Lot 867:
1923, black surcharge 50pf on Sower 50c Prussian blue, vertical block of 50 (5×5+5×5) with horizontal gutter in the middle, gutter at right, selvages at bottom and on the left, three horizontal folds, one large separation between third and fourth rows of the top pane and a few small ones mostly on margins, full OG, NH, F/VF centering, probably the largest known multiple of this desirable color variety, PF certificate, Mi #61a, C.v. €22,500 as singles, Est. $2,000-$3,000, Sc. #59
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