Todd-

It looks like you have a pretty rare piece there. From what I can tell, the only regular season game where the Redskins wore the red jersey was 11-13-05 versus Tampa Bay

5 photos of Portis from that game are located here
http://www.viewimages.com/Search.asp...partner=Google

Type in 2005 Clinton Portis Tampa to see the photos

Do the marks in these photos match the ones on your jersey?