I would say Chinese myself. the glass appears thick and clumsy, with an irregularity to the shape of the neck. To me this indicates fast, high volume production which would lean me to Chinese glass. In most of the pictures the mouth and neck do not appear really symmetrical..... A fairly Chinese trait IMHO.
Craig
Have to agree with Craig on this. I would favour Chinese on this and not Japanese. The shape and the neck of the rim look clumsy. I would expect with a Japanese piece more uniformity. Just my opinion.
I would rule out Kamei as usually there pieces have some uniformity to it and they did have quite a few master blowers working at the company.