The Tibetan knife ZhenjieWu posted has a single line of copper on the pommel, and the pommel is no wider than the rest of the handle. This is the same style seen on Chinese, Mongolian, and Manchu utility knives. The Boan dao posted by ZhenjieWu all have flaring pommels with decorative copper/brass work. The two knives posted by other members share this characteristic pommel design, so until a similar example can be found from another culture, I will agree with ZhenjieWu that these are Boan dao.
Josh
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