These fellows wouldn't earn the sobriquet of callow – they look like they have been very busy at living. There is no photographer's mark or identification of who they are or where they hailed from, but they sport confidence and appear to have made a success of whatever they have been up to. The one on the left has a little Paul Newman/Butch Cassidy thing going there (before there was a Newman, but contemporary with Cassidy); the man on the right has either had one or two boilermakers at the saloon next door or that is just his habitual appearance; and I think the man in the middle is the owner and preserver of this small cabinet print, but that's just my guess. When this trio walks in, look out!