Hi Jeff,
Difficult to see if all is correct without better pics, but it looks OK at first glance.
It's a Master Mariner 12-hours chronograph from the mid 60's (1965-1966?).
The version shown in this scan is the SS version, as you can see it has luminus hands and also another dial configuration.
To my knowlage, it doesn't have inhouse movement (Valjoux?).
Chronographs is not my strong suit...
Best
Blomman
PS. Bonus on this scan - Polaris 65!