A nice example of a classic 214 Accutron. Apparently the word "Waterproof" was used initially and then changed to "Water Resistant" in 1969. Later in 1969, all reference to water resistance is removed. It was added again after 1971 to increase flagging sales, but I must make the following cautionary statement:
Accutrons are NOT waterproof, and never were. Even excessive wrist sweat can fog them up, and entry is provided, especially in the 214, at many points, not the least of which are the setting mechanism and battery hatch. If you have a nice old Accutron, treat it kindly, and keep in mind also that the stainless steel on these will also corrode over time when exposed to moisture, most commonly around the crystal, in the seat, where it cannot be seen unless the crystal is being changed. Your Accutron has survived all these years, it would be a shame to lose it to corrosion or water damage.
Images used with kind permission of the original owner.