For a Song prototype of this shape see the guanyao vase included in the exhibition, Chinese Ceramics, Los Angeles County Museum, March 14-April 27, 1952, Catalogue, no. 114; and another in the Cox Collection, with Yongzheng mark was illustrated by Paine and Young, "A Preliminary Report on the Sub-Surface Structure of Glazes of Kuan and Kuan-type Wares", Far Eastern Ceramics Bulletin, vol. 3, Serial No. 23, September 1953, pl. IIa. A ge-type vase with a Yongzheng seal mark is illustrated in the Catalogue of Chinese Government Exhibits for the International Exhibition of Chinese Art in London, vol. II, Nanking, 1948, no. 254, where it is described as chuantai hu (vase with tape holes). Compare, also, the vase in the Baur Colleciton of this shape covered with a glaze imitating junyao, incised on the base with the archaic seal characters, xuan he, illustrated by John Ayers in the Catalogue, vol III, Geneva, 1972, no. A353, where the author proposes that the mark refers to the collection of antiquities of the Song Emperor Huizong, the catalogue for which, the Xuanhe bogu tuly, was first printed in 1310, and reprinted on various occasions thereafter