This number is rare. There is no example in the image database.
Diameter; from shape book, 9-1/2 inches (24 cm)
Shape book 'B'
Agate Ware range, 185 - 193.
In shape book 'B', the page for numbers 185 & 186 is headed "Variegated Ware". The sketches indicate this style by scribbled shading. The same scribbled shading appears on each shape in the range 185 - 193. There are so far only a couple of examples in the image database, and they are indeed agate ware.