Mary,
Did you ever resolve who's picture this is? I am sure he is a descendant of John vibber born in 1689 and I have a pretty complete compilation of his descendants. If you can tell me where you purchased the picture I can give or make a list of a few. John happens to be the most common name for Vibbers.
I would very much like to get this into the hands of his descendants and to get a copy of it myself
Dave Veber.