This jar was probably made at the Yaozhou kilns in Shaanxi province, and a small jar of rather more compressed form with similar decoration, excavated from the Tongchuan, Yaozhou kiln, is illustrated in Yaozhou Kiln, Xian, 1992, where it is attributed to the Tang dynasty. The technique used to decorate this jar, the jar being turned by hand as it is dipped into the brown glaze, may also be compared to that used on a jar of rather different form in the collection of the Tokyo National Museum. The Tokyo jar is illustrated in Masterpieces of Yaozhou Ware, Museum of Oriental Ceramics, Osaka, 1997, no. 11, where it is dated to the Tang dynasty, 9th century.