5c Blue (179).
Used with two each 2c Vermilion and 3c Green (178, 158),
tied by smudgy cork cancels with red "New York Registered Jul. 20" circular datestamp on cover to Chemnitz, Germany, with "M. Kottshofski Dealer in Foreign Postage Stamps" stamp dealer's corner card,
additional purple dealer handstamp on back, 5c with a couple minor perf flaws, couple small cover nicks, still Very Fine and colorful early stamp dealer advertising cover to Germany
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