Even very old lume will often have a little bit of emission after strong light--as long as it fades quickly, it is likely to be the original. The scratches on the back are consistent with watch-wrench oopsies. The mid-case might have gotten a polish at one point, but the back was left alone so that the inscription stayed sharp. The clear lesson here is: don't crack your watches when you're on your third whiskey of the night (or morning--no judgement).