Story is this: "This was given to my aunt and signed on 8/12/80 after a photo shoot w/ Bob Gruen. My aunt was friends with Bob. It was given to me in 1990 and I've had it framed for the last couple of years. I have other known examples below the signature for comparison as the signature is abbreviated but I know it to be authentic. Never had it checked out due to the fact that my aunt obtained it."
Thanks for your opinions!