By the dial it seems to be a Beau Brummel, but I've never seen one with an all steel case before. I also haven't been able to find it in the ads database. I'm hoping the experts here can figure this one out.
It's got the same dial (albeit in white) as this watch: https://mybulova.com/watches/1964-beau-brummell-12138
Looks like this watch is a mix of parts from different eras. The case (or at least the back) is from a 1950 Watertite, and the dial is from a 1961 Beau Brummell. Case also resembles the Astrojet. The 30 jewel movement and diamond dial would have come in a solid white gold case.
Interesting combination, albeit Non-Conforming.
Watches that are assembled from various models using components from different eras are tagged here as Non-Conforming, which is our way of noting that the watch does not "conform' to a standard factory model. Typically the year we assign will be the production year of the case, if known.