French physicist (1859–1906), best known for his pioneering investigation of radioactivity, who shared the 1903 Nobel Prize in Physics with his wife, Marie Curie. Hand-addressed Faculte Des Sciences De Paris mailing envelope, 5.75 x 4.5, addressed in Curie’s hand to “Monsieur L. De Lammay, 31 Ruse de Bellechane, Paris.” In fine condition, with some scattered light toning and soiling, and a couple small pencil notations. RRAuction COA.