This CDV, photographed "from life" by Louis Bertin shows Mr (later Sir) Charles Wyndham, the famous actor, surgeon and later founder of London's Wyndham Theatre.
He has a fascinating biography which can be read on Wikipedia (click here), highlights of which include the fact that he volunteered to become a brigade surgeon during the American Civil War; he performed on stage in the UK with Ellen Terry, and once in New York shared the stage with the actor John Wilkes Booth who assassinated President Abraham Lincoln.
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Here is another Bertin card from my collection, this time showing one of his non-celebrity clients (as far as I know!).
If you would like to read much more about Louis Bertin then I recommend the wonderful page on the Sussex PhotoHistory website dedicated to the Bertin family, with many illustrations. Follow this link.