I know this is one of the A11 produced by Bulova the question which I doubt we'll find out is the watch is issued to Army Air Force 1942 but movement is 1945 so is it a 45 watch with a replacement backplate or a 42 watch with replacement movement? It also has the dreaded second hand stutter but I have read this is common because it is a modified 10Ak movement so because it is indirect drive you get this stutter because of play in extra gear train. Watch keeps great time.
I don't think there's any doubt it's an A-11. Ray tells me that AF42, according to literature he has, indicates the watch is Army Air Force issued for 1942. Incidentally, 'Army Air Force' is the US branch of Military know today as "Air Force". He also mentioned that the regular Army issued watches were coded as ORD. I'm not sure I was aware of either detail.
I don't know if the serial number indicates that the case was produced in 1942 or if the s/n indicates that the order for the cases was placed in 1942 but will, for the sake of this discussion accept the former. As the movement was made in 1945 by it's date code I would accept the watch as original and date it 1945.
1942 Bulova A-11