It seems to me that there is some sort of date code stamped in to one of the posts, I want to say the ground post. Can't remember what it represents, if it was when it was made? For example a 10 over a 95 would be Oct 1995, see if you have a code like that. I think on the originals there made be a round decal on top of the case or maybe the side that says VPC (Vehicle Prep Center)
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