I went to look at a 71 Barracuda today that has been in the same family since new. Sticking out from under the fender tag was a smaller square tag. It had 2H 2H stamped in it. The letters were a similar font as the fender tag's, but were slightly larger. Also, there were two holes shaped like the letter P. I've never seen this before. Any ideas? I've also posted about some interesting quirks on this car over on the interior board if you are interested.
-JeffAARy