One of a pair of comparable vases but of hexafoil lobed section is illustrated by Stanley Nott, Chinese Jade Throughout the Ages, Tokyo, 1962, pl.CXIV. Compare also the large grey gu-shaped vases illustrated in The Complete Collection of Treasures of the Palace Museum, vol.3, Jade Carving, pp.164, fig.132 and p.165, fig.133. For similar engraved Qianlong Fanggu marks, see idem., figs. 147, 150,151,153.
Spinach jade to imitate archaic bronzes is obviously the best choice for a convincing archaism. The present examples follow an archaic prototype quite accurately both in shape and the decorative motifs used. A Late Shang/Early Western Zhou Dynasty bronze original was sold in these rooms, 12 November 2002, lot 4, with similar extending flanges around the rim.