Late 1980s TIMEX Diver Quartz today. 100 meters water tight, screw down crown, rotatable bezel (bi-directional, but that 'mistake' can also be seen on higher priced watches of that type).
But that's not all: The seller claimed that it has a helium valve! You need that in saturation diving where the air is enriched with helium and when coming up again, the diver spends some time in a decompression chamber where the helium, which has penetrated into the watch, cannot get out quickly enough again and the crystal would otherwise be blown off. This nonsense, holding a prominent place in the 'derailments' in watchmaking, can also be seen on very expensive watches. In reality, this will never be used simply because such a watch will never be used by 'real' divers who are equipped with professional instruments and would get fired otherwise.
So (fortunately I got this watch in NOS condition and very cheap) I tried that at home, not expecting any helium to come out, but just out of curiosity, and you know what? The date advanced by one day every time I pressed that button.
Well done Timex!