Definitive Kiloware: United States from the late 1970s and early 1980s

Clipping 1-072: Block of four of the 1c Thomas Jefferson stamp, with two singles of the 40c Thomas Paine stamp, and singles of the 5c George Washington and the $1 Eugene O'Neill stamps. Clear "PITTSBURGH, PA 152" postmark, dated April 9, 1975 or 1976. Below I show a detail of some of the stamps.
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