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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 (Image)