Originally Posted by DWalt

It's called a Leg of Mutton case, and they once were very popular for takedown rifles and shotguns, usually hard leather. I have had several of them, but have only one today. Back in the old days they were used by hunters who traveled some distance to hunt by train, when cars weren't common. Sort of an early version of a carry-on bag. They are seldom seen today, and those which do show up are in need of a thorough restoration. I have five takedown rifles and three shotguns, and they all fit OK in my L-O-M case. Maybe they are still made, but if so I am unaware of them.