A gents stainless steel 'Jo Siffert' Autavia Heuer wristwatch, circa 1970, A gents stainless steel 'Jo Siffert' Autavia Heuer wristwatch, circa 1970, ref 1163T, serial number 225029, the circular signed cream dial with subsidiary dials to 3 and 9, date aperture to 6, luminescent baton hour markers and blue seconds hand, tachymetre rotating bezel and asymmetric case signed Heuer-Leonidas SA, 17 jewel movement, case diameter 42mm, with original Heuer "Bead of Rice" Gay Freres bracelet with HLF end links to the folding clasp.