Those signatures seem a bit different to me after looking at others. I think both Farrell's and Alda's are different due to the thickness of the sharpie. Here is a recently signed Alda book (attached).
I honestly have no idea if I got hosed on my original picture yet.
The best way to find out is to compare your
Alda photo with one that has an Authentic signature.look for gaps in sisnature,skips smudges etc.keeping inmind that as people we dont sign the same everytime.
Hope this helps.
Regards,John Bailey