3¢ Rose (65), carefully affixed beside window of Leeds & Franklin lattice window patent envelope and tied by blue "Balto. Paid" double-circle cancel, matching "Baltimore Md. Jul. 15" circular datestamp, U.S. Sanitary Commission corner card and addressed to O. C. Bullard (Special Relief Agent of U.S. Sanitary Commission) at Philadelphia, enclosure on Sanitary Commission letterhead mentions New York draft riots of 1863, Extremely Fine, probably the finest example extant of this rare patent envelope which beautifully preserves the window lattice of the Leeds & Franklin envelope, while this is a positive for the collector, it demonstrates the sender's misunderstanding of the purpose of the envelope, which was to have the stamp and dated postmark become affixed to the enclosed letter when the letter was removed (see the following lot for an example where this occurred), ex J. S. Rich, Perry and Kantor (fig. 20 in their book)

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