Who Were These Guys?

I purchased this interesting image about a week ago at an antique show down in Portsmouth, NH. It is an old beat up tintype, made probably the decade immediately following the Civil War (1865-1875). The man on the left is a fairly handsome chap, with a nice felt halt, jacket and striped vest as well. It makes me think he had a little bit of money to spend, and he clearly did not do manual labor to earn his living. The younger man on the right is not dressed quite as nice, with what looks like a white linen or cotten jacket and the big poofy hat doesn't seem to fit him quite right. Yet there is something that drew my eye to this picture and captured my imagination. The two men are too close in age to be father and son, but they clearly had some sort of friendly relationship, enough to pose for a picture together that has survived over a century!