So, do I indeed have a light blue and a dark blue or not??? I know it is kinda hard to tell from the pic but it is the best I can do with my stupid camera.
My SWMBO, Starburst looks just like the one in the middle. Very dark vibrant blue on the star-bursts, and a much lighter blue handle. The handle does not look faded, nor does it have any wear marks, it looks as if it was made that way. Except for a bit of a lazy door which does close tight I would call hers near mint. I may be wrong if the handle should be the same color blue as the star-bursts.
Gillette made every color every year, so the date codes won't help you there, sorry.