A larger mortar (26.1 cm. diam.) of exact shape and design was excavated from the Xuande stratum at the site of the Ming Imperial Factory, and was included in the Chang Foundation Exhibition, Xuande Imperial Porcelain Excavated at Jingdezhen, illustrated in the Catalogue, Taiwan, 1998, pl. 16-2 ; pl. 14 shows a similar undecorated mortar with an incised Xuande mark of comparable size to the present lot.
This same design of dragons is also seen on a few larger thick-walled bowls that might have been used as dice bowls, one illustrated ibid., pl. 16-1; one illustrated in Blue and White Porcelain with Underglazed Red (I), The Complete Collection of Treasures of the Palace Museum, Hong Kong, 2000, pl. 124; and another in the National Palace Museum, Taiwan, included in the Catalogue of A Special Exhibition of Dragon-Motif Porcelain, 1983, pl. 14. On these bowls, the mark is inscribed within a double-circle on the interior.