German physicist who originated and developed the Quantum Theory. Awarded the Nobel Peace Prize in 1918. ALS, one page, 6 x 8.25, Prof. Dr. M. Planck letterhead, January 5, 1942. Letter, in German to a colleague. Accompanied by the original mailing envelope, addressed in his hand. Very clean, and in fine condition. COA John Reznikoff/PSA/DNA and RRAuction COA.
