The original is held by the Wellcome Collection, see: https://wellcomecollection.org/works/rqkvbfdh
They note: "This is one of a collection of original glass negatives made by John Thomson. The negatives, made between 1868 and 1872, were purchased from Thomson by Sir Henry Wellcome in 1921"
They date the photo to 1869, but don't give the source.
Date picture taken
1869 (year is approximate)