Extremely bold ink signature, “Charles Darwin, July 6th 1870,” on an off-white 3.25 x 5.5 sheet of Down, Beckenham, Kent letterhead. In very good to fine condition, with faint staining to trimmed edges and several moderate horizontal folds. Although Darwin had published On the Origin of Species in 1859, it was not until 1871’s The Descent of Man—released one year after this signature—that he first used the word ‘evolution.’ Pre-certified PSA/DNA.
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