Taillight trivia

['69Novajoe]

This might have been posted before, and I haven't really done any research on it, but how many of you have heard (or know) that you can "sometimes" tell the year of a GM car by looking at the taillight for the date?? Again, I don't know when this started or if it's just GM cars, but I thought it was worth looking into. By looking at this picture, most of you will probably be able to tell what car it's from, but can you tell me the year of the car?? I submit that you can't, unless you see the whole car, because it's a taillight that was used two years in a row. Can anyone tell me how many other's there are like this where a taillight was used for a couple years or more??