A very similar, though larger (15.9 cm. high), Longquan celadon zhadou, dated to the Song dynasty, was sold Sotheby's, New York, 31 March 2005, lot 33. See, also, the smaller (8.6 cm. high) example dated to the late Northern Song dynasty, illustrated by Zhu Boqian in Celadons from Longquan Kilns, Taipei, 1998, p. 171 no. 143.