http://www.rockislandauction.com/viewitem/aid/67/lid/332

This is one of the more practical knife/pistol combinations I have seen - it actually has a pretty reasonable grip when used in either capacity. It has two muzzleloading smoothbore barrels, with a percussion cap hidden under each top ear of the crossguard and a folding trigger in the body of the grip. RIA lists it as being French in origin, and I have no reason to suspect otherwise. Pretty neat!