Mitch, It might be worth posting that picture on the armed forces board as well for identification, and likelihood of it being Robert based on dates, ages etc. I may very well be wrong, but that uniform looks a bit "Napoleonic " in which case would be the wrong era to be Robert, however I realise that uniforms spanned several eras. This is just an impression.
If you do post on armed forces, make sure you mention that you have this thread running and provide a link to it.
It is not very clear, but that doesn't look like a photograph to me. It looks like some kind of illustration, so not likely to be a relative of yours unless he was of high standing. No colour photos back then either.
Is it an illustration taken from a book?
That is not to say that your gggrandfather was not in this regiment. (but we know how some family members can sometimes get things wrong
).
