Thank you Michael, that's just the sort of information I was hoping it would be possible to get from the photo. It seems, however, to mean that I may have misidentified my ancestor.
Michael, does the fact that he is wearing Scottish regalia mean that he was likely to have belonged to a Lodge in Scotland? Also, how does 'Installed Master' relate to 'Master Mason'? Is it a different degree?
Carol, I have looked at the original photo under magnification and I can't make anything out on the lapel jewel, so we won't get it from a scan. However, here's one anyway in case other clues emerge.
Many thanks to you both for your informative replies.
Simon