The unglazed rim of the present jar and its comparison to similarly shaped examples with covers indicate it originally had a cover. A similar Ding jar with cover was excavated from the tomb of Yan Deyuan, dated to 1189, and is illustrated by J. M. Addis, Chinese Ceramics from Datable Tombs, and Some Other Dated Materials, London, 1987, p. 28, pl. 19a. Another similar jar and cover in the collection of the Buffalo Museum of Science is illustrated by W. Hochstadter, "Ceramics of the Five Dynasties and Sung Periods," Hobbies: The Magazine of the Buffalo Museum of Science, vol. 26, no. 5, June 1946, no. 88. A Ding jar of similar shape, but with a rounded lip, in The Victoria and Albert Museum, is illustrated in Oriental Ceramics, The World's Great Collections, vol. 6, Tokyo, 1976, no. 80.