In 1959 Heuer brought the wrist stopwatch Game Master onto the market. The target group were radio, television and film directors, rally drivers and sports referees and coaches.
Because of the strap the watch was suitable for drivers who could wear it on the wrist for time control. The left zero pusher could be blocked by turning a screw to prevent accidental zeroing.
The watch was produced until 1964; it is now again available as re-edition.
- http://www.koch-classic.de/contents/de/p613.html Re-edition, koch-classic.de] (German)