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.

After I had finished filming, it was brought to my attention that while it does not have the proper markings, this piece is very, very similar to an 1846 Postførerverge - a double-barreled blade/gun issued to Norwegian postal employees after a rash of deadly assaults on rural postal workers. Those were made from 1846 until 1854, with a total of 152 being manufactured. Could this be one with the markings worn off or removed? Perhaps. It could also be a commercial copy, or something else entirely.