ALS in German, signed “M. Planck,” one page, 5.75 x 8.25, stamped personal letterhead, June 12, 1938. Letter thanking Samuel Clemens' distant cousin Cyril Clemens for electing him an honorary member of the Mark Twain Society. In part (translated): "I have received your kind letter of 22.4 in which you notified me that the Mark Twain Society has elected me as an honorary member and I want to thank you very much for that. It will be my special pleasure and honor from now on to be permitted to count myself amongst the members of your greatly esteemed Society.” Also includes a letter from Einstein’s secretary forwarding Planck’s address. In fine condition. Accompanied by the original mailing envelope addressed in his own hand. Originally purchased from Goodspeed’s Book Shop and accompanied by their transmittal letter. Pre-certified PSA/DNA.
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