A George III provincial silver mustard pot and a pair of similar salt cellars

A George III provincial silver mustard pot and a pair of similar salt cellars, the mustard by Thomas Watson, the salts by Dorothy Langlands, Newcastle, no date letter, circa 1805, oval form, bright-cut decoration, the mustard with a pierced border and domed hinged cover, the salt cellars with a Greek key border, on four bracket feet, with blue glass liners, one liner a.f, length of mustard 8.2cm, approx. weight 4oz. (3)