That is a finial to buy a pen for. The shape of the nib is the same on the now discontinued (I think) Hero 389, one of the few Chinese pens I still use regularly. It is a surprisingly good and consistent writer even when filled with potentially difficult inks. I nick-named mine the Zulu because that nib shape brought to mind the shape of the shields used by the Zulu warriors in the film Zulu from the 60s.
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