Jessica Rawson in Chinese Jade from the Neolithic to the Qing, British Museum, 1995, p. 184, discusses jade ceremonial blades of this type, and how they evolved from stone reaping implements. The author illustrates several long jade ceremonial blades of a type similar to the present blade including a thinner blade (50.8 cm.), possibly from Shaanxi Shenmu Shimao, north-west China, dated to the Neolithic period, c. 2000-1000 BC, that is now in the British Museum, p. 184, fig. 3. Another in the Freer Gallery of Art (77.8 cm.), p. 185, fig. 4, which is also dated to the Neolithic period, and possibly from the Longshan culture, has the addition of notches carved at the ends and a face carved in profile along what appears to be a damaged cutting edge. The stone of the Freer blade appears to be opaque and is mottled. Two smaller jade blades (45 and 28.9 cm.), each of which has an arrangement of holes similar to that of the present blade, are also illustrated, pp. 186-7, nos. 10:17 and 10:18, and are dated to the Neolithic period, c. 2500-2000 BC.