An interested visitor from Lancaster PA, USA has sent me this image and information about this miniature portrait of Jacob Westhaeffer (1818-1895) by John Henry Brown, which is helpful as another indication of his painting style.
The sitter, Jacob Westhaeffer
ran a book bindery in Lancaster, and together with another business man,
John Geist, ran the Lancaster Museum. That building no longer exists.
On opening the case, which had never before been opened, it was possible to photograph J H Brown's signature and date- of September 26, 1839. This was compared to a copy of the Rosenbach Museum listing of his works, and Jacob Westhaeffer (of Lancaster) is second on the list. Thus this is interesting as an early example of his work.