It looks a little like an aquanaut. But there is less engraving. It appears to be 1950 because it has an LO code on the back
Face, case shape, center peaked crystal and jewel count all appear to be a match to Aeronaut, but subject watch lacks engraving between the lugs.
I also find this casing without any engraving, different face and 21 J in the Douglas and Ambassador line. It's a very cool watch, I am currently at
unknown but still digging.
Yes meant that. I had aquanaut on the brain. If it is an aeronaut it does seem odd missing the engraving between the lugs that is what was throwing me. It runs great keeps great time. I wear it to work at least once a week. Get very funny looks at my baby looking watch. I appreciate you looking into it, I don't have much info on it.
I just bought the identical watch, and my guess was the same: a 1950 Aeronaut, with the only difference from the 1949 Aeronaut being the lack of engraving between the lugs. I guess the answer won't come till somebody uncovers an ad — but the Aeronaut doesn't seem to have gotten a lot of marketing — or a 1950 relic from a jewelry store with the tag still attached. I'd love to have it conclusively identified, but I'm happy with the watch regardless.