The result of Oxford thermoluminescence test no. 566y79 is consistent with the dating of this lot.
These gui vases were used as containers for cereal offerings during ritual banquets commemorating the ancestors
See a gui with a comparable shape and decoration (altought it has also a band around the foot) illustrated in J. Rawson, Western Zhou Ritual Bronzes from Arthur M. Sackler Collection, Massachussets, 1990, p.405, no.48
Another example with a comparable decoration is illustrated in Catalogue to the Special Exhibition of Grain Vessels of the Shang and Chou Dynasties, National Palace Museum, Taipei, 1985, pp.200 and 201, pl.16