I'm not sure how I ran into this awesome signature study about Roy Rogers on YouTube, but it's worth checking out:

Part 1 (Secretarial Roy Rogers):

https://www.youtube.com/watch?v=w5luWpRPZZ8

Part 2 (Authentic Roy Rogers):

https://www.youtube.com/watch?v=Op4YDTLGJQU

Based on those videos, it appears to me that these eBay autographs with PSA/DNA authentication are secretarial:

http://www.ebay.com/itm/Roy-Rogers-Signed-8x10-Color-Photo-PSA-DNA-...

http://www.ebay.com/itm/ROY-ROGERS-SIGNED-AUTHENTIC-8X10-PHOTO-AUTO...

My guess is that at least some of the exemplars that PSA/DNA uses are well intended as authentic, but actually secretarial. It's not hard to see how this can be a rough trade when watching the attention to detail paid by the expert in the videos. I wish there were more like him!

This one looks good:

http://www.ebay.com/itm/Roy-Rogers-Dale-Evans-Dual-Signed-8x10-Phot...

Thoughts?