I always thought that brass knuckles and switchblades got outlawed back in the 1930s and balisong/butterfly knives and martial arts weapons in the 1960s as an attachment to the existing law...
All that's incorrect for the US.
There is no US fed law banning possession, manufacture or sale of knuckles, saps or blackjacks.
There's no federal law in the US banning possession, manufacture or sale of switchblades either (out side of fed territories) that are imposed on the states. There are US laws restricting interstate commerce in switchblades (selling across state lines) and in shipping at 15 and 18 USC, but they are not outright bans. This causes manufacturers and dealers to jump through a couple of hoops is all.
The "switchblade law" restricting interstate sales of switchblades dates from 1957.
Individual states have laws on the books banning or restricting knuckles, saps and/or switchblades, but each state is different and one state may have no restrictions on any of them while another restricts one or more of the three while a third may ban all three.
Again, the rules on knuckles, saps and switchblade possession and carry are individual state and local laws.
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