A very similar Kangxi dish, also with Xuande mark, is in the Baur Collection, illustrated by John Ayers, The Baur Collection, Chinese Ceramics. Volume Three. Monochrome-glazed Porcelains of the Ch'ing Dynasty , Geneva, 1972, no. A 299; another similar but slightly smaller example is illustrated in Monochrome Porcelain, The Complete Collection of Treasures of the Palace Museum (Beijing), Hong Kong, 1999, p. 23, no. 20; and another comparable example is in the Percival David Foundation (no. 512). Mr. Ayers claims that wares of this type are precusors of the peachbloom wares, made towards the end of the Kangxi period.