http://www.freerepublic.com/focus/news/2860375/posts?page=11#11
Arpaio says he has found someone to agree to investigate the postal stamp forgery and I suspect it is one of two postal inspector groups...
Another note PA-RIVER, the outer rim of the stamper was permanent for as long as the stamper was used, probably many years, so that got worn more than the outer edge of the year date, which makes your theory of the 80 getting more wear more plausible. I guess that until there is an explanation for all those post marks with the wrong uspo designation, I will continue to be skeptical of something, not knowing just what, but still believing the year on Obama's SS card is fraudulent.