Nobel Prize–winning German physicist (1858–1947) who pioneered the understanding of quantum theory. ALS in German, one page, 5.75 x 4.2 postcard, September 9, 1943. Letter written from Carinthia during World War II to his friend Felix Stumpf. In full (translated), “What sad news your Sept. 4 letter contained! Poor Elisabeth, to have lost what was dearest to her. Of course, we will write to her immediately. (I will send the letter to your address and ask you to make sure she gets it). We had no idea that it all happened as far back as August 23. What a good thing that you kept your dog Alfred. We are having the kind of splendid fall here that forms a strange contrast to the unspeakable suffering that people inflict upon each other. We will not be staying here much longer, but will not be back in Berlin for some time.” In fine condition, with a light overall shade of toning. COA John Reznikoff/PSA/DNA and R&R COA.