This example compares very favourably to an excavated vase in the Dean County Museum, Jiangxi, illustrated in Underglaze Blue and Red, no.8, p. 25; compare also with another vase in the Umezawa Collection included in So Gen No Bijutsu, pl. 204; another illustrated by N. de Castro, A Cerâmica e a Porcelana Chinesas, pl.163, p.199; and another, excavated in the Philippines and illustrated by Feng Xian Ming, Essays on Chinese Old Ceramics, Forbidden City Publishing, 1987, fig.10, p.44. M. Medley illustrates another similar vase in Yüan Porcelain and Stoneware, pl.38B, and a similar faceted ewer from the Baoding hoard, ibid., pl.39A, where she notes that these faceted forms, which posed technical problems for the Chinese potter and are rarely found after the end of the Yuan period, may have been of Mongol origin, or influenced by Near Eastern metalwork, not only from Persia but also from Syria and Mamluk Egypt. Similar vases were sold in these Rooms, 13 December 1976, lot 101, in our New York Rooms, 30 May 1991, lot 305, and in our Hong Kong Rooms, 31 March 1992, lot 529