This 1677 Lely is based on another portrait of Queen Mary II. The previous image can be traced to the National Portrait Gallery in London that dates it to 1677. This is a re-colored version of the same portrait so I date it as 1677.
Keywords: 1677, Lely, Queen Mary II, Orange family, Stuart family, Queen, Dutch, curly coiffure, chemise, modesty piece, scoop décolletage, elbow length puffed under-sleeves, bodice, bertha, quarter length under-sleeves, full skirt, necklace, draped bodice ornament, clasps