Bulova 1952 Co Ed
Thanks to OldTicker, this is being corrected to a "Coed".
The second ad from 1954 shows one that looks virtually identical to this one.
On the movement itself, just below the word Swiss, is what looks like L1, which would be 1951.
And, thanks to William Smith, what I thought to be a box and the letters MX, actually is BXW, an import code. I was looking at it upside down. . .