Convolute of three prints 2nd half of the 20th century, Berto Lardera (1911-1989), ''Blue Yellow Red'', color lithograph, handsign. u. num. 180/250, on the reverse stamp: Jahresgabe 1959 Kunstverein Hamburg '', Herbert Bodzin'' Mathematische Graphik '', unknown printing on glossy paper, handsigns and numbers 8/70 and verso canceled, Miroslav Sutej (1936-2005), krotatischer painter and Graphic artist, op-art composition on a pink background, handsigned and numbered 42/45, sheet dimensions up to 62 x 48.5 cm