Believe this to be a 1945 Navigator. Dial is in rough shape, otherwise it's really fine.
Looks the same as http://www.mybulova.com/watches/1943-navigator-5216
Mike

In reply to 1945 (triangle) on movement. by mirtlem
In reply to Mike - Remember, it's really by Geoff Baker
Updated.
Geoff, if you could point me to the discussion that outlines how you can use the case s/n to help determine the year, that would be great. Anything that helps make an informed decision on whether to pull the trigger on an auction would be great. Thanks!
Mike
In reply to Updated. Geoff, if you could by mirtlem
Not sure Mike, where exactly that is. In a nutshell we decided a couple years back that pre case dating ( date coded case backs), the leading digit of the serial probably indicates the year of manufacture. At the same time we debated how to handle date codes that didn't match. Your watch for example has a '45 movement in what we think is a '44 case. Inasmuch as the difference between '44 & '45 is one day we assume the newer of the two, meaning this is a 1945 watch. When we find more than a year or two we generally go with the case and wonder if the movement was swapped out at some point in the past. I must also state that this theory falls apart in watches older than 1924.
In reply to Not sure Mike, where exactly by Geoff Baker