I have a 1983 quarter that does not specify if it is made in Denver or Pennsylvania it is just a small dot down by the end of his hair and some other interesting details
The early P's looked like blobs. They started making them a bit larger so they didn't chip and fill so easily. Sometimes you see the same problem with the D's.
Or an Egyptian missile base...........sorry.........residual affects of late sixties, early seventies college life.