The early porcelains 1796-1815 are mostly unmarked.
A very rare painted mark in red c.1805-10.
A distinctive impressed mark c.1815-1825.
The Society of Arts felspar backstamp, printed in brown or purple c.1820-30.
A Printed mark in blue c.1830-50.
Various 19th century painted marks incl. imitation of Meissen and Chelsea.
CBD Monogram painted in gold or blue c.1850-65.
A painted mark in gold on ornamental wares c. 1860-75.
Printed mark (in brown) on tablewares c.1870-80.
Crown printed marks (in green or pink) c.1881-1920.