5c Blue on Chemical Paper, Experimental Essay (179-E4).
Tied by "Boston Mass. May 21, 1888" postmark on cover to Weisbaden, Germany and forwarded to Hamburg,
light strike of "Boston Mass. Paid All Direct May 22, 1888" cds, Weisbaden and Hamburg backstamps, missing top flap, tear at top of cover from file fold well clear of essay
VERY FINE. THIS IS THE ONLY KNOWN COVER BEARING A 5-CENT TAYLOR EXPERIMENTAL STAMP ON CHEMICAL PAPER.
A wonderful showpiece
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