10c Motorcycle, Special Delivery (E15). Tied by Earliest Documented Use Chicago Ill. Nov. 17, 1927 12PM duplex cancel on legal-size corner card cover from "Law Offices of Burton & Burton Chicago" to "The Commissioner of Patents Washington, D.C." , additional "FOR 20-HOUR TRAIN" handstamp, opened at sides, crease at left side

THIS IS THE EARLIEST DOCUMENTED USE OF THE 1927 10-CENT SPECIAL DELIVERY ISSUE, SCOTT E15. THIS PREDATES THE OFFICIAL FIRST DAY BY TWELVE DAYS. AN IMPORTANT BACK-OF-BOOK ITEM.

This is most likely non-philatelic in origin and contained legal documents that needed to be "rushed" to Washington's Patent Office.

Ex Markovits and Dr. Martin. With copy of 1975 P.F. certificate

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