Well Nibbi among other chinese mfg they just use the design of Keihin and Mikuni.
You can get an OSAKA PWK, OKO PWK, Nibbi PWK, Polini PWK, Keihin PWK.
All of them will look similiar, but the Keihin and Polini will be above the Nibbi and that one above the OKA and OSAKA.
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