Opinions wanted on baseball autograph
 

I picked up a box of 1971s recently and found this in it:

http://photos.imageevent.com/exhibit...e%20signed.jpg

As I understand the story, Moose died in 1976 in a car wreck on the way to his 29th birthday party. So, I am trying to authenticate and get some idea of value/desirability, as I purchased the lot to fill out a set and I will be offering it for sale if the autograph is good.

Looks good as compared to other authenticated items. The background and felt tip don't make it easy. :)