Heuer made literally hundreds of different stopwatch models through its long and storied history, to include the new-old stock 1980s Heuer Ref. 1082 Microsplit 100 Digital 1/100 stopwatch here, with original Heuer box, instructions, and warranty paperwork.

The Microsplit is a unique, specialized timer that tells time and calendar indications, as well as full stopwatch functions.  This Microsplit 100 is in good working order, and includes its original lanyard.

The Microsplit 100 measures 1/100 of a second, up to 59 minutes and 59.99 seconds, with start, stop, time-out, split and reset-to-zero functions.  Heuer advertised quartz accuracy of +/-0.0004%, with battery use of longer than two years.

Eduard Heuer founded the Heuer Watch Company in 1860 in St. Imier, Switzerland.  In 1911, Heuer introduced the first automobile dashboard chronograph called the "Time of Trip."  This timepiece revolutionized the world of automotive racing because it enabled the pilots and co-pilots to keep track of their lap times.
 
In 1914 they changed the sports world once again with the introduction of the first wrist worn chronograph.  Heuer’s dominance of the stopwatch market continued into the 1970s and 1980s, when electronic stopwatches finally dethroned them.

Check out Heuer’s history on the excellent Heuer-dedicated sites, Calibre11 and OnTheDash.