Old porcaline cup and saucers

Old and worn. Unknown age. Markings on bottom of cup and saucer only say Made in Japan in red.

cup is 3 1/2" wide 2" deep round not tappered. inside is all white no decoration. handle is white with a central liniar gold stripe. Rim of cup has worn gold colordesign on cup is light blue/sky and yellow around the cup and a windmill, painted over the blue and yellow background, with red roof sitting on a bright green schrub like design and black for ground design.  Saucer is 5" wide with light sky blue almost water color style and orange color at level of horizon and a small area of island/landscape on right edge of saucer mid area of edge. bottom is again a blue shade watercolor style.   There are three saucers and one cup.