Dial faintly says BULOVA.
Outside Case Back: 10K ROLLED GOLD PLATE, BULOVA, L7
Inside Case Back: BULOVA, FIFTH AVE, NEW YORK
Case measures 22mm wide (not counting crown) x 39mm lug tip to tip. 16mm lug gap.
The 21 Jewel 7AK U.S.A. is marked 46 date code. So the movement is obviously a swap since point of sale. It's how I found it though. Note the movement retaining sleeve in the inside case back photo.
I'm still looking for an ad suggesting what model the case could be, and w/o jewel count, its even harder to ID the case.
It may end up "Non Conforming" but the case may be ID'ed.
Another example of this case is here : 1956 Unknown