Glenn Burke--Has anyone ever seen one of his autographs/does it have any value?

I found this real oddball autographed 1979 OPC the other day:

Has anyone ever seen one before? I couldn't find any Glenn Burke autos on eBay. Also, does anyone think PSA/DNA would authenticate it? I looked at their fee schedule and he wasn't listed, it may be too obscure a player for them to have enough other signatures for comparison.

Has anyone ever seen one before? I couldn't find any Glenn Burke autos on eBay. Also, does anyone think PSA/DNA would authenticate it? I looked at their fee schedule and he wasn't listed, it may be too obscure a player for them to have enough other signatures for comparison.
Collecting Tony Conigliaro
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[edit] Butt Five
The least used type of high five is the "Butt High Five". This is when two people go for a high five but miss and one or both of the participants' arms continue down the other's back, hitting the other person's butt. In a professional setting, this type of high five is called "Sexual Harrassment."