A DERBY BOTANICAL SHELL-SHAPED DISH PAINTED WITH A SPECIMEN OF GLADIOLUS CARDINALIS, SUPERB GLADIOLUS WITHIN A GILT-LINE RIM, NAMED TO THE REVERSE WITH CROWN, CROSSED BATONS, D MARK AND PATTERN NUMBER 197 ALL IN BLUE, WM. DUESBURY AND CO., CIRCA 1795 -- 9¼IN. WIDE