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Auction: 142 - March Philatelic Collector's Series Sale
Lot: 546

#C22a, 1930 1P Slate blue and red, with blue Zeppelin overprint inverted, o.g., l.h., some foxing at top, otherwise fine and rare; only 100 stamps received an inverted overprint; signed Kneitschel and another.

Sold for
$140