Info on caseback looks to be acid etched, very faint. Case is a two piece waterproof where the bezel (with lugs) goes over the crystal and caseback. Movement comes out through the crystal, and has a two-piece stem.
Would be (L) 'WATERTITE' IMO.

ad Dated 1952
In reply to Would be (L) 'WATERTITE' by FifthAvenueRes…
I looked at that, but the self-winding bit didn't seem to match up. It looks sorta like the Jet Clipper, which matches the stainless steel.
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I don't think there were any Automatic "Watertights" . I'm probably wrong but any Water Tite I've seen are all manual winders in a one piece case that utilized a bexel ring to hold the crystal over a flange on the case itself.
good point, wasn't paying attention to the automatic factor, I read 'movement comes out through the bezel' and immediately thought 'WATERTITE'.
AbslomRob
There is only one distinctive lugged case for the model in mid-1950s thru early 1960s named "Clipper." is shown in the ad & example below.


There are several dial variants that also appear in this classic Clipper case. e.g.

The Bulova family of Clipper watches branches off into many mid-fifties to early sixties models with different cases, but those models are sufixed with Clipper e.g. Royal Clipper, Jet Clipper, Yankee Clipper & many more.
1959 Royal Clipper

1962 Jet Clipper

In 1962 Bulova adverised 4 different versions of the Jet Clipper.

I knew it wasn't the original "clipper", but I couldn't (still can't) figure which "sub" model it is (which is why I selected "clipper" as the model). The "Sea Clipper" looks like a closer match, but I don't see that model appearing in the 1956 time frame.
agreed

Dated M7 with a 10 ALAC.
AbslomRob
I took the liberty of cropping your watch on the left for side-by-side comparison to one of my unknown watches. The watch on the right is 34mm in diameter w/o crown. What is the diameter of the subject watch?


Sweet Fifth, nice ID dude.
12 Years is a stretch...