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 fine condition, with light wrinkling to the image, and old mounting remnants on the back. Accompanied by the front panel from the original mailing envelope (affixed to a slightly larger sheet), addressed in Planck's own hand.
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