For an example decorated in mottled 'pebble' colours, see Robin Reilly, Wedgwood, London, 1989, vol. I, p. 354, fig. 460; also fig. 481 for an example sponged grey-blue in imitation of porphyry. See Also Ars Ceramics, Number 11, 1994, p. 49, cat. 20a for an illustration of the authenticated mark similar to that on the present base.