Nobel Prize–winning German physicist (1858–1947) who pioneered the understanding of quantum theory. ALS in German, one page on the reverse of a 5.5 x 3.5 postcard depicting the Sonnblick mountain, August 22, 1932. Letter to Gustav Krupp von Bohlen und Halbach. In full (translated): “To the chairman of the board of the Sonnblick Observatory, in whose footsteps I am walking, I send my greetings and best wishes for summer recreation.” Two punch holes with small tears to the top edge, otherwise fine condition. Accompanied by a small unsigned photo of Planck. Pre-certified PSA/DNA and RR Auction COA.
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