"More than any other brand, the chronographs that the racers wanted in the 1960s and 1970s were the Heuers. Talk to racers from this era, and they will tell you that having a Heuer chronograph was the "in thing". There were less expensive watches, but they weren't as good as the Heuers. And there were the higher-priced, more elegant watches -- sometimes given as prizes or promotions -- but these were not the watches that the racers were wearing for their work. The racers identified with the Heuers; these were the real racers' watches of the 1960s and 1970s."
http://www.onthedash.com/racers.shtml
Tag Sebring Heuer split-second dashboard-timer, similar to the one Walter Roehrl used when racing the legendary "Night of Arganil".