Very nice example of the 1960 Bulova Senator "B". It sports a pretty unique case that has held up very nicely through the last 50 years. This model was ID'd from the ad posted on this site:
Now that dial's exactly like the one I have...except I wonder why mine's a 11AC and this one's an 11AF? As I've always said, and stand by, there's no exact science to what Bulova did or didn't do. Time and time again we see variations that defy logic (not necessarily here, in this case) and explaination and that doesn't always mean "Non-Conforming" except to certain people. Nice watch Plainsmen!
Yeah gents... that one has a pretty cool case.
I think it's a pretty good concensus with the regulars here on the site that Bulova throws a monkey wrench in it's absolutes with probably putting whatever stock they had on hand into the case for production.
We all can see the various 1+/- case to movement differences and have to speculate that's what happened. Unfortunately all the records are gone... gone... gone.
That's why it's great we have this place to try to architect our way through these old bones!