Dr. C.J.A. Jörg, Porcelain and the Dutch China Trade, The Hague, 1982, p. 179, fig. 89, notes that according to the Dutch East India Company's 'Requirements' of 1773, there existed a narrow type for a single herring and a wider version for two, and that dishes were painted with either one or two herrings for their respective requirements. For a single 'herring' dish and a Delft prototype, see Howard and Ayers, China for the West, vol. I, p. 85, no. 42.