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

Clipping 2-018: Block of four of the 20c George Marshall, three 3c Francis Parkman coils showing the dividing line of the plate, what is these days referred to as a plate number coil (PNC), and single $1 Eugene O'Neill, postmarked by Johnstown, PA block four bars postmark. The date is unreadable.
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