The crown was at the 12 o'clock position, as these first wrist chronographs were adapted from pocket chronographs.

Heuer introduced its first wrist chronograph in 1914. A top-mounted crown allows the user to set the time a button mounted in that crown operates the start/stop/reset functions of the 'duration of trip' counter. A small pair of hands mounted at the top of the dial (12 o'clock position) indicates the duration of the trip (up to 12 hours). Designed for use in automobiles and aircraft, two large hands mounted from the center pinion indicate the time of day, as on a traditional clock. In 1911, Heuer received a patent for the 'Time of Trip', the first dashboard chronograph. Įdouard Heuer patented his first chronograph in 1882 and in 1887 patented an 'oscillating pinion' still used by major watchmakers of mechanical chronographs. In 1860 Edouard Heuer founded Uhrenmanufaktur Heuer AG (English: Heuer Watchmaking Inc.) in St-Imier, Switzerland. TAG Heuer Carrera automatic chronograph with tachymeter 1860 through 1880s

Tag heuer calibre 16 cas2111