Natural scientist who formulated the theory of evolution, a highly controversial stance that challenged the established norms of science and religion. Fountain pen signature, 'Charles Darwin,' on an off-white slip, matted with a nice engraving of Darwin, to an overall size of 7.5 x 11. In fine condition, with some light spotting to bottom of matte. COA John Reznikoff/University Archives and RRAuction COA.