That is a beauty and I have no idea what it is. I would have bought it myself... I'm going to play devil's advocate and make some observations. Seeing "anti-magnetic" on the dial is odd, I don't believe I've ever seen that before on a 1940's Bully. Looking at the inside of the case back, it appears there are 4 rough areas like spot welds that seem to correspond with the lug attachment points that don't seem to me to be up to Bulova quality finishing standards.
When did Bulova address and halt third party marking of watch cases and faces as Bulova, without "re-built" or "Movement" on the face?
It's also possible this watch and your other in identical case were short runs for a specific buyer (short lived/unadvertised), ie. company award watches, or maybe war drive awards?. I will agree it's a very uncommon watch, whatever it is.
With nothing to compare to, and the existence of at least 2 others in this casing (yours and Lisa's) that are marked "Bulova"
1943 Unknown for now, and a very cool one indeed.