First chronograph with a central 100th-of-a-second hand turning one revolution per second and 100 jumps per second (3 times faster than on the historical Heuer model). There is no visible tremor during rotation.
Dual control system: one for chronograph functions and one for setting watch time. It’s the first 100th of a second wrist-worn stopwatch. The two balance wheels (4Hz clock and 50Hz chronograph) are visible through the open case back.
Unlike a conventional chronograph, the time base is not dependent on the watch (hence the name “stopwatch”). Chronograph functions can be start or stopped independently of watch functions.
Automatic winding of the watch by means of a circular oscillating weight. Chronograph winding is done manually (once is 90-minute power reserve is depleted). Winding the chronograph also winds the watch : both barrels are wound at the same time.
Extremely easy-to-read chronograph scale on the outside edge of the dial indicating tenths and hundreds of a second.
Chronograph power reserve at 12 o'clock. The 90-minute-power reserve (indicator) is independent of the watch’s (two separated barrels). 42-hour power reserve for the watch.
Chronograph second counter and date at 6 o'clock.
Chronograph minute counter at 3 o'clock.
Small seconds counter at 9 o'clock.