"The term "derringer" has come to refer to any small-sized handgun that is neither a revolver nor a semi/fully automatic pistol. It is not to be ...
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confused with mini-revolvers or pocket pistols, although some later derringers were manufactured with the pepperbox configuration.
The original Philadelphia Deringer was a muzzleloading percussion cap single-shot pistol introduced in 1825 by Henry Deringer. In total, approximately 15,000 Deringer pistols were manufactured. All were single barrel pistols with back-action percussion locks, typically .41 caliber with rifled bores, and walnut stocks. Barrel length varied from 1.5 to 6 in (38 to 152 mm), and the hardware was commonly a copper-nickel alloy known as "German silver"." - (en.wikipedia.org 29.09.2020)
