Found this unique set of brass knuckles on YouTube

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Here is a refurbishment YouTube video on a unique Chinese, Japanese? A set of brass knuckles multitool. The clue to where this came from is the incorporated tobacco pipe. He restored it to take a cigarette, but the tobacco bowl is a dead giveaway that it is Japanese, and that means this might be Yakuza. If you look really close, you can just see Japanese script stamp on the blade.

Japanese Tobacco pipes.