This is a Avocet Vertech wrist watch which was worn by members of the Seaquest DSV crew during the show. This multifunction watch has a time, ambient temperature, altiude and date display on its LCD screen. The watch is a black colour which grey accents and a set of green and purple function buttons on the lower face of the watch. It has a nylon web strap band, indicating it is an apline specific model watch.
In the 2nd and 3rd seasons of the show the original Casio g shock watch was replaced with this Avocet brand and can been seen being worn by all of the main cast of the show in several episodes during both seasons. Though the watches were never functional they completed the uniform setup of the crew members serving aboard the Seaquest. The episode I was able to find with a scene of a charater wearing this watch was in season 3 episode 13 "Weapons of War" being worn by Commander Jonathan Ford.
This is a replica of the original Avocet Vertech watches used in the show.