The present mug appears to be the earliest known dated example. Cf. Rackham, Glaisher Collection, pl. 30, no. 299 for an example dated 1710; Rackham and Read, English Pottery, fig. 57 for an example in The Hanley Museum formerly in the Twyford Collection and dated 1695; also Rous Lench Collection, Sotheby's London, July 1, 1986, lot 73, dated 1690; and Rous Lench Collection, Christie's London, May 29 & 30, 1990, lot 90, dated 1701