Designed in Belgium in 1860, the Apache centerfire revolver attracted a following in the French underworld because it combined three weapons in one: a single-action six-shot revolver, a dual-edged bayonet, and a set of brass knuckles that doubles as the revolver’s grip. The knife and the knuckle duster fold inward, so the whole apparatus can fit easily into a pocket or bag.

Without sights, trigger guard, or safety, the gun is tricky to operate, but then you probably won’t want it for long-range shootouts. “It was designed for self-defence and to be used at very close quarters,” said Charles Hartley, who auctioned off one of the few specimens in 2014. “There is no barrel to the gun so the user would have had to have had it pressed up against someone’s chest.”

Though its pinfire bullets are now obsolete, the weapon’s novelty still attracts collectors — another Apache, auctioned in 2013, drew $2,850.

(Thanks, Carlos.)