The Heuer Carerra reference 3147 also called "Dato" (because of the date feature) was launched in 1966, with unusual positioning of the date at 12 o'clock. The first execution featured the date at 12 o'clock, but the fact that the chronograph seconds hand covered the date, most probably lead Heuer to soon move the date from the 12 o'clock to the 9 o'clock position. Interestingly, even though associated with the world of motor sports - the name Carrera is a tribute to the Carrera Panamericana, an automobile race on open roads in Mexico that ran from 1950 to 1954 and considered the most dangerous and deadly of car races at the time - the minutes counter records up to 45 minutes rather than the habitual 30 minutes and is more in line with the timing of halves of a football match than that of fuel injected automobiles racing at ground-breaking speed on asphalt. The present lot will appeal to the chronograph enthusiast in general and the Heuer aficionado in particular due to its particularly fierce look with bold bevelled lugs, its stealthy, all black dial highlighted by the white chapter ring and the striking contrast of the red date disc.