When I started my collection some time ago I got my first lot and this autograph came along with others.
I personally do not really like and always left aside for later study its authenticity or not!
Some negatives: It was authenticated by GAI; They authenticated only one of the signatures and the wrong name yet the musician (see the images); the other not authenticated signature and Brun E. Carlos I personally do not like the pen stop between the letters Br u.
Positive factor: the seller and member of the UACC.
In fact we must analyze autographs 2: 1 Brun E. Carlos in the right disc and the other signature (that it authenticated as Robert Neilson) which I believe is Robin Zander. What do you think?