Heuer. An extremely rare stainless steel chronograph wristwatch with regatta count-down register calibrated for 15 minutes Signed Heuer, Skipper, ref. 7754, case no. 105’645, circa 1968 Movement: cal. 7730 with special Skipper 15 minutes counter wheel, hand jumping every 30 seconds, 17 jewels, manual, signed Heuer Leonidas SA Dial: signed Case: screw back, signed