1961 Movado SubSea cal. M95.

Look closely at the textured subdials, note the unique Kris hands of the chronograph registers, a Movado design hallmark. They almost never survive the passage of time, so to find a watch with them still in place is unusual. Note also that the minutes sub-dial goes to 60, which I believe is unique to the 95M movement as well, a feature developed at Movado’s request by Frederic Piguet.
After the fusion with Zenith the M95 movement had been replaced by the Martel-Zenith 146 (in fact a similar Super Sub Sea version exists but the 3 sub counters are more spaced from each other.
The M90/M95 movement is the first modular chronograph ever produced, giving the lead by at least 30 years with respect to any competitor.

Movado is an American luxury watchmaker best known for its Museum Watch designed in 1947. Movado was originally founded in 1881 in Switzerland by Achilles Ditesheim. In 1983, the company was purchased by Gedalio Grinberg, a Cuban-born Jew who fled Fidel Castro’s Marxist Revolution in 1960 with his family.