Obsolete Revolver

 A buddy brought over an interesting revolver, because he knows I like such things.  Reportedly, his great-uncle brought it back from World War 1.  It's a double-actin revolver in some obscure 10.5 mm cartridge.

The frame is marked 1913, and there is a proof mark that I don't recognize. The butt is round, and has a lanyard loop.  No trigger guard.  A note in the case says that it was made in the Eibar region in Spain.

The trigger folds, like a Patterson revolver. The loading gate swings down, to the rear.

It's a weird revolver, about the size of an N-frame Smith.  It holds six shots, and I admit that I have exhausted my knowledge about it.