A BERLIN RECTANGULAR PORCELAIN PLAQUE painted by Wagner after Thomas Gainsborough with a portrait of Mrs. Siddons seated to the left wearing a black hat with two red plumes and a ribbon, a striped mustard-yellow dress tied at the waist with a lilac ribbon and with a white fichu, orange shawl and a fur stole (slight scratches to surface), signed, impressed KPM and sceptre mark, incised 220 148, circa 1880, giltwood frame decorated with foliage and a laurel-wreath