Chamberlain's Worcester fine coffee cup and saucer of Baden shape painted and gilded in imari style with the crest of a boar's head and initial JB, similar to a service purchased by Sir James Yeo c. 1818. 
See Geoffrey Godden, Chamberlain Worcester Porcelain 1788- 1852, plate 135, page 116 and Plate XI for examples of Yeo service.
Diameter (saucer): 5. ins.
Condition: Minute chip to rim of cup, perhaps a bubble in firing. Virtually no wear
Mark: none
Enquire about Chamberlain Yeo type c-s lb17688