Cf. H. Rissik Marshall, Coloured Worcester Porcelain of the First Period (1954), pl. 3, no. 52 for a related sauceboat and pl. 52, no. 1059 for a Bristol sauceboat with similar moulding; also see Simon Spero, Worcester Porcelain The Klepser Collection (1984), p. 33, no. 23, col. pl. 10.
The paste of the above example closely resembles that used by Benjamin Lund at Bristol, the current example may well be made at Bristol and decorated at Worcester.