Don't like the Mantle but like the Williams...
Authorized is when someone's office sends autopen signed letters with their knowledge. For instance, astronaut Autopens from NASA, presidents from their office, politicians, etc. These are documented and typically limited to know patterns.
Unauthorized is when a forger gets an Autopen machine and produces fakes to deceive collectors without the knowledge or permission of the person who allegedly signed the photo.
I don't like this either. But, could it have been signed by Mick on a bad day?
Not unless the Mick was operating the Autopen machine. It's an unauthorized Autopen signature with no-doubt characteristics.
"I don't like this either. But, could it have been signed by Mick on a bad day?"
Click to zoom in and look at the ribbing in a lot of the letters. That's a sign of certain kinds of mechanical signing.