Small 19th century frame, portrait of Madame de Montferrand, late 18th century style

Very beautiful small blackened wooden frame, dated 19th century. If not earlier (?) Porcelain painting of a young woman in the style of the late 18th century (French school?), Madame de Montferrand as indicated on the back on old tanned paper mounted. High quality painting, very fine. Dimensions: 12.5 x 12.3 cm. Very good condition!.