Derby? octagonal replacement plate painted with the arms believe to be from the Douglas family (David Howard, Chinese Armorial Porcelain, Vol. I, page 542) 
 with a heart and the motto SPERO, meaning 'I Hope' c. 1780-1810
(attribution of this plate is tenuous and Thomas Wolfe and Spode have been suggested)
Width:  8.75 ins.
Condition: Good
Mark: no mark
Price: 380
Enquire about armorial plate db35625