An Ancient Chinese Kuei bronze vessel attributed to the Middle Western Zhou period was examined by x-radiography. Important information regarding its method of manufacture and composition was obtained. Radiographs and photographs of the vessel reveal: its porosity and uniformity of composition; mould marks and chaplets indicating a piece-mould construction; scratch marks and a possible broken sprue on the bottom, indicating direction of casting (upside down); round radiopaque features in the upper decorative band. This provided technical evidence in support of the authentication and the stylistic analysis and evaluation of this vessel.