So when PSA authenticates autographed cards, the person who submits it has a couple of options:
1) Request confirmation that the autograph is authentic and the card is authentic, in a red flip. That's what you have. This card can only be added to the 1972 Topps PSA set registry, but not the autographed set registry.
2) Have just the autograph authenticated: blue flip
3) Have the autograph/card authenticated and then the autograph graded. There is a PSA/DNA set registry for autograph collectors, but to use it, the autograph must be graded.
You may want to consider sending it back to PSA to have them grade the autograph (1-10 scale) and you may gain more when you sell it.
http://www.psacard.com/dnasetregistr...ion.aspx?c=143