I just retired a Timex Ironman Triathlon 200m digital watch. It was time for a battery (at least its third, possibly its fourth), when I noticed that the Mode button had failed. (I never use it as anything but a watch these days, having pretty much given up diving.) That watch was easily 15 years old, and had been at least 100' underwater (wreck diving off North Carolina).
That watch was the cheapest diver's watch you could buy, by a big margin. Timex was very careful NOT to call it a diver's watch, because of product liability concerns, but IN FACT that's what it was and a lot of people used it for diving. (On their 50m and 100m water-resistant models, Timex very carefully said that the water resistance was guaranteed only as long as no buttons were pushed, and they very carefully did NOT say that for the 200m models. That language has since changed.)