Dimension : 12.5 x 18cm Good condition, traces and marks of wear, see photos for detail, stamp on the back. Professor Albert Einstein (1879 - 1955), Nobel Prize winner in Physics (1921), mathematical physicist at home, in Princeton, New Jersey, holding a pipe., 1950s. Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist best known for developing the theory of relativity. Einstein also made important contributions to quantum theory. His mass–energy equivalence formula E = mc2, which arises from special relativity, has been called "the world's most famous equation". He received the 1921 Nobel Prize in Physics for "his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect". sends by La Poste