Uncertain if this is Japanese or Chinese, but it is certainly hand-painted in an Asian / Oriental style. In the centre of the curved plate/dish, there is a soft-blue mythical-looking dragon or seahorse-like creature. It is really rather lovely, but I do not know the provenance of this old piece. The glaze is crackled and the base is hand-painted with a signature and numbers. There is also a name signed on one side of the base. See photos. It measure 18.5cms across.