Late 18th C. Chinese Export Imari Armorial Plate – Williamson

Chinese export porcelain Imari armorial plate, circa 1800.
 
Dimensions: Approximately 9½”.
 
Decoration: 
The rim is edged with a thin band of gold and blue.
 
The rim is decorated with alternating panels of iron red, blue, and gold arabesques and iron and gold floral sprays, with the Williamson crest with the motto; “Sub Umbra Alarum Tuarum” at the top and bottom.
 
The center has a design of bamboo, peonies, and the sacred mushroom.
 
The reverse is unmarked.
 
The crest was granted to Joseph Williamson, a Secretary of State to Charles II, in 1664.
 
According to Howard “Chinese Armorial Porcelain”, Vol. 1, at page 781, there were a number of Williamson families with this crest, but none recorded exactly as above. 
 
Condition: Minor rubbing to gilt; otherwise in excellent condition consistent with age and usage.