Here is a classic self-defense tool from the 1870s. The Apache Revolver is a brass knuckle duster knife gun that fires six 7mm pinfire cartridges. Only a few thousands of these were made in Belgium. The locking blade is double edged. The below video shows this portable gun in action:
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1869 "Apache" Brass Knuckle Duster Knife Gun
More information is available here.
[Source] [Credit: Michele M. F.]
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