A very rare archaic bronze ritual food vessel, Fangding

A very rare archaic bronze ritual food vessel, Fangding
Late Shang/early Western Zhou Dynasty, inscribed Zhu Fu Ding
Crisply cast in rectangular section supported on four straight legs decorated with cicada blades, the body cast with taotie masks in relief below pairs of confronted kui dragons, all reserved on a leiwen ground, centred and flanked at the edges with flanges, the top rim set with a pair of upright loop handles, the interior cast with a two-character inscription, with olive and light green patina and malachite encrustations. 26.2cm (10 1/4in) high.