Tapio Wirkkala for Rosenthal, a 'Secunda Grau' six-place dinner service, 1960's, including dinner and lunch plates, side dishes, cups and saucers, a teapot, an oval platter, two lidded tureens, and a gravy jug and saucer; together with four Rosenthal white dessert bowls, two plates and a purple bowl, manufacturer marks to the bases