I believe this is an Academy Award "M". This is a tiny little watch like the "KK", smaller than the "A" or "B" size. The lines of the lugs look different at different angles so I will add a second shot.
The case is 10K gold filled and dated stamped L1. The 5AD 21 jewel movement is dated stamped L1 as well. The movement is working, it started up when I took it out but there is something wrong with the stem. It will turn the hands but does not set back in to wind. I will be looking into getting that fixed. The case didn't come with it. It is a recent purchase as well.
In case anyone wants to see the inside of the case.

It's a beauty Kathy. 'M' looks like a good match.
1951 Bulova Academy Award M
In reply to It's a beauty Kathy. 'M' by Geoff Baker
Thank you Geoff! These ("M" and "KK") are much prettier in person than they look in the listings.
Sweet!
1951 Bulova Academy Award "M"
In reply to Sweet! 1951 Bulova Academy by neetstuf-4-u
Thanks Bob!
1951 Bulova Academy Award "M", nice addition
In reply to 1951 Bulova Academy Award by jabs
Thank you jabs : )
I'd also agree with the 'M' variant. Very nice watch with box!
In reply to I'd also agree with the 'M' by Andersok
Thanks Ken!