Nobel Prize–winning German physicist (1858–1947) who pioneered the understanding of quantum theory. Fountain pen signature, “Dr. Max Planck,” on an off-white 4.25 x 2.75 card. In fine condition, with trivial rippling to upper portion. Accompanied by the original mailing envelope, addressed in his own hand, and postmarked July 6, 1934. Pre-certified PSA/DNA.
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