The poster child nowadays for count down bezels is the Tudor FXD designed for timing intervals of a charted course swum underwater a kind of
link dead reckoning in which you use a compass to maintain a bearing and swim at a certain speed over a certain
link span of time in order to reach a particular waypoint. There are a surprising number of count-down bezel watches out there in
link addition to the FXD though including models from Mido and Blancpain.