Nobel Prize-winning German physicist (1858-1947) who pioneered the understanding of quantum theory. Unusual 4.5 x 7 photo card bearing a printed message in German (translated), "For the kind congratulations on my eightieth birthday, I say my heartfelt thanks," signed and inscribed below in fountain pen by Max Planck, who adds a date of May 3, 1938. In very good to fine condition, with light creasing and edge-silvering to the image. Accompanied by the original mailing envelope.
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