Thanks for you comments.
I really don't have a data sheet for the LCD itself. I know it was made by Densitron due to a sticker on it but beyond that there were no identifying markings. I managed to get it running by identifying the controller chip and a lot of ohming traces.
I will be using this in potentially unknown lighting condition and the LCD will be remaining in it's original case. The rest of the case has been re-purposed but the screen is form fit to the top of the case and the mounting screws all line up... that's really the only reason i care for this specific display.
Essentially what i will be doing is taking an old control station from work and making it into a smaller form version of the same thing. kind of a "display" model if you will. I can't do that with the OEM boards but i would really like the general interface to be the same and that's one of the main reasons i was looking to keep the original screen instead of getting a known value of an off the shelf model.