For other glasses of this type but slightly earlier, see W.A. Thorpe, A History of English and Irish Glass (1969 ed.) pl. LXXXVIII (3); 'Strange & Rare', Catalogue, 50th Anniversary Exhibition 1937-1987, The Glass Circle, p. 15, no. 34; L.M. Bickerton, Eighteenth Century English Drinking Glasses (Woodbridge, 1986) no. 77; and the examples sold in our King Street Rooms, 11 December 2000, lot 68 and 15 June 1994, lot 50.