Cf. J. & G. Lewis, Pratt Ware, English and Scottish relief-decorated and underglaze coloured earthenware, 1780-1840 (1984), p. 147, also Surgeon Captain P.D. Gordon Pugh, Naval Ceramics (1971), pl. 31A & B for a similar jug.
Viscount Adam Duncan (1731-1804), admiral, began his naval studies in 1746. In 1749 he became midshipman in the 'Centurion', and was promoted to lieutenant in 1755. He participated in the attack on Gorée, helped to reduce Belle Isle. He commanded the 'Monarch' in 1780, under Admiral Rodney. In 1787 he became a rear-admiral, a vice-admiral in 1793, and an admiral in 1795. Following the defeat of the Dutch in the Battle of Camperdown on 12th October 1797, Duncan was awarded the titles of Baron Duncan of Lundie and Viscount Duncan of Camperdown.