Scarce "Office of the Postmaster General, Official Business" mailing cover featuring a block of four 2¢ stamps honoring the 50th anniversary of the first incandescent electric light, canceled on the stamp's day of issue, June 5, 1929, at Menlo Park, New Jersey, signed at the bottom in bold ink, "Thos. A. Edison." Addressed in type to Professor Waite Edward Worden in Millburn, New Jersey. Handsomely mounted, matted, and framed with a portrait of Edison to an overall size of 14.75 x 23.25. In fine condition.
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