Dark-glazed jars of this type, decorated with vertical ribs of trailed white slip, were produced in various sizes and shapes at a number of Cizhou kiln sites in Shandong, Henan and Hebei provinces. A similar jar from the Seligman Collection now in the British Museum is illustrated in Oriental Ceramics, The World's Great Collections, vol. 5, Tokyo, 1981, no. 122. Another similar example is illustrated in Mayuyama: Seventy Years, Tokyo, 1976, p. 191, no. 567, together with a related black-glazed ribbed jar, no. 566, and a jar with ribs arranged in groups of three, no. 565.