Model no. 89, designed 1957. Artist signature and silver stamps. One pair date stamped N7 - 1966 and the other pair F7 - 1959. Literature; Marianne Aav, Rosa Barovier Mentasti and Gordon Bowyer, et al., Tapio Wirkkala: eye, hand and thought, exh. cat., Museum of Art and Design, Helsinki, 2000, p. 363.