Earthenware manufacturer at the Old Hall Works, Hanley, Stoke-on-Trent, England

• a short lived partnership between Charles Meigh, his son - also named Charles Meigh and James William Pankhurst.

• the partnership was dissolved in July 1850 (although some trade directories continue to list the partnership 
  as late as 1852 - probably as a result of poor updating).

• the business continued as Charles Meigh & Son and J.W. Pankhurst continued on his own account. 

NOTICE is hereby given, that the Partnership lately subsisting between Charles Meigh the elder, of Hanley, in the county of Stafford, Manufacturer of Earthenware, Charles Meigh the younger, of the same place, Manufacturer of Earthenware, and James William Pankhurst, of the same place, Manufacturer of Earthenware, carrying on business under the style or firm of Charles Meigh, Son, and Pankhurst, hath this day been determined and put an end to; and, that the partnership business will in future be carried on by and under the stile or firm of Charles Meigh and Son, by whom all debts and demands against the former partnership will be paid and discharged, and to whom all debts and demands owing and belonging to that partnership are to be paid and satisfied.—Dated this 6th day of July 1850.

Charles Meigh.
Charles Meigh, junior.
J. W. Pankhurst.

SUSA
C M S & P 

The Meigh family (& other potters) added faux  Chinese marks to their ware to give the impression of the orient to their ware even though it was produced in England.

California is the pattern name 

Improved 
Stone China

printed faux  Chinese mark

(photo enhanced)