In earlier centuries, gentlemen carried flintlock single-shot pocket pistols, in some cases even with a bit folding bayonet on them, of their tailcoat pockets. That gave approach to the percussion single-shot that even now however bears a Model of Henry Deringer of Philadelphia’s name. William Elliott’s Double Derringer, as made https://beckettehowu.thezenweb.com/olding-pocket-pistol-for-dummies-71145107