A very similar jade bangle in the Asian Art Museum of San Francisco is illustrated by J. Rawson, Chinese Jade from the Neolithic to the Qing, British Museum, 1995, p. 42, fig. 28, where it is dated neolithic or Shang period, c. 2000-1500 BC and attributed to southern China. The author suggests that the link scroll design may have been derived from face patterns on Liangzhu culture cong and that similar decoration appears on jades at Jiangxi Xin'gan Dayangzhou. Another similar, but more thinly carved, greenish-yellow jade bangle dated to the Shang dynasty is illustrated by Bo Zhongmo in Guyu Jingying (The Art of Jade Carving in Ancient China), Taiwan, 1989-90, p. 59, fig. 18 (right).