John Peck, AKA The Mad Peck designed the now iconic Live Off Hope poster in 1978. It stands the test of time still selling as a poster and a 4.75"x7" postcard.
There is just the right amount of space on the back to write a note to your college roommate who hasn't lived on the East Side in 30 years and tell them they need to come back for a visit!
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The Super Time in PVD postcard depicts the zeppelin dock on top of the Industrial Trust Building that could have been but never was. It measures ~3.5"x5.5".