Why too good to be true? Price very low -- or from a shady seller? I've seen worse forgeries (if this is one) but never have I seen a Harrison and Lynne on a Tom Petty LP.
The price is 500 which I would consider low since it has Harrison on it. The autographs themselves look real enough to me especially the Petty one which is almost identical to one I got in person some years back. But I don’t know about the Harrison one