Vive la 6,9! (Long live the 6,9!)

JEAN TINGUELY (1925-1991) Vive la 6,9! (Long live the 6,9!) signed, titled and inscribed 'bien cher Roger VanThournout J'espere que vous allez bien & vive la 6,9 Jean Tinguely'; inscribed 'una belle Machia Perlei ccHima' (on the reverse) gouache, watercolour, coloured pencil, graphite and paper collage on card 10 ¼ x 19 ¼in. (26 x 49cm.) Executed circa 1968