A good Chinese armorial plate 18th century

A good Chinese armorial plate 18th century, painted with the arms of Christian Augustus, Prince von Annhalt-Zerbst and his wife, Johanna Elisabeth, Princess von Schleswig-Holstein-Gottorp, the parents of Catherine the Great of Russia, 23.2cm. Provenance: the Helena Woolworth McCann collection. Deaccessioned from the Metropolitan Museum in New York. The Clifford Henderson collection. Purchased from the Chinese Porcelain Company, New York in 1986. Cf. John Goldsmith Phillips, China Trade Porcelain, pl.28, where this plate is possibly illustrated.