The rather cursory nature of the coat-of-arms renders identification difficult. However, it bears comparison with another Swatow blue and white dish painted with two ships and a large fish (replacing the narwhale of the current example) illustrated by Nuno de Castro, a ceramica e a porcelana, Chinesas, vol. 2, col. pl. 72, where the author attributes the motifs to the City of Lisbon

For another Swatow example in polychrome see Nuno de Castro, Chinese Porcelain and the Heraldry of the Empire, col. pl. 17, where again the author states that the birds around the heraldic motif and the ships in the center of the dish are a free and fanciful interpretation of the arms of Lisbon