Royal Crown Derby in the Rosemary Celedon pattern, number A277. The outside of cup has pale blue band with three gold stripes. The inside of cup is in white with a gorgeous spray of flowers in color. The saucer has the pale blue band at outer edge, white in center with the same gorgeous flower medallion in colors; there's a gold stripe between the two. Both the cup and the saucer are signed by the artist and designer F. Garnett. He was a designer for Royal Crown Derby from 1930's to 1950's.
Measurements: Saucer = 5 1/2" wide; Cup = Height = 2 3/8" Width = 3 1/8"