All working lovely military WW2. Solid silver case, not chromed. No more info, let you do the work! ; )
Thanks Will and OT. I will review the information and post what ever info I feel is pertinent to this watch.
This picture was provided by Mark on another post as being the case from Bulova Type A-11. Please note, exactly the same as my case.

Military Issue A-11 is going to be my call. Regardless of the metal used to case the watch its stamped A-11 on the back or are we thinking that it could have been changed?
In reply to Military Issue A-11 is going by mybulova_admin
Agreed, it's an A-11.
Two ticks from me for tentative, based on the possibility of the solid silver military case being non-military issue, and Jay's Bigfoot comment. I can always change later.
Bob, is the case hallmarked, maybe between the lugs? What's the case back composition? Thanks.
In reply to Bob, is the case hallmarked, by DarHin
No hallmarks, Darren. Case is regulation size, looks exactly like the Bulova case spec picture Mark posted, and according to a local High Street jeweller the case is solid silver, but of an unknown content. He said he could tell straight away, just from the colour of the case, a kind of soft yellow. The case back is S/S.
Now wish me a Happy Birthday, guys! 53 today!
In reply to No hallmarks, Darren. Case is by bobbee
Happy Birthday Buddy. I'm 53 years young too! Enjoy
HAPPY BIRTHDAY! (yelling so you can hear me in case your hearing aid isn't on)
If the non-plated silver case was not military issue how can the model name be "Military Issue"? Until we have evidence that a non-plated silver case WAS issued by the military shouldn't this be non-conforming or possibly a "Civilian Issue A-11"? Granted, all other pertinent details of the watch match the military issue.