German theoretical physicist (1901–1976) awarded the 1932 Nobel Prize in physics for the creation of quantum mechanics. TLS in German, signed “Heisenberg,” one self-contained air mail page, 6.75 x 10, January 3, 1950. Letter to Dr. F. L. Breusch. In part (translated): “I am going to have so many obligations within the upcoming future because of the research council that I did not know if I could accept your invitation. Well, I do believe now that I could come to Istanbul perhaps just before Easter holidays end March—beginning April. Certainly provided that I get permission from the Allied authorities to travel abroad. I would then travel with the airplane from Frankfurt am Main and flight must go over Italy since I do not think getting permission to fly over Russian assigned territories. Therefore, I will apply for visa permit for an airplane route over Italy.” Intersecting folds, light toning, edge wear and creases along top, and light show-through from postmarks on reverse, otherwise fine condition. Pre-certified PSA/DNA.
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