1c Gray Blue, 3c Green, 10c Brown, Experimental Papers (206 var, 207 var, 209 var). Tied by "Cambridge Mass. Jan. 13, 1890 7PM" duplex cancels on registered 3c Green entire (U312) to New York City, purple Cambridge registry boxed handstamp and registry no., red "Boston Mass. Registry Div. Jan. 13, 1890" oval backstamp, light vertical file fold at left well away from stamps, portion of back cut out

VERY FINE. A RARE AND UNUSUAL COVER WITH THREE DENOMINATIONS ON EXPERIMENTAL CHEMICALLY TREATED PAPER. A MARVELOUS ARTIFACT.

This is similar to Francis patent paper, and was part of a series of experiments to prevent stamp re-use.

With 2008 P.F. certificate

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