Sought-after ink signature, "Heisenberg,” on an off-white 2.5 x 4.25 sheet bearing an affixed image of the theoretical physicist. The sheet is affixed to a card, with the reverse bearing an affixed "Max-Planck-Institut fur Physik" label and signed in black ink by Heisenberg's son, "Thanks for sharing the letter, Jochen Heisenberg." In very fine condition. From the collection of Stephen Adamson.
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