And the answer is:

and for those who don't know (or forgot):
ANACS No Grade Codes (I think they're the same for PCGS...)
No Grade codes
82 Filed Rims
83 Peeling Lamination
84 Holed and Plugged
90 Not Genuine
91 Questionable Color
92 Cleaning
93 Planchet Flaw
94 Altered Surfaces
95 Scratch / Rim Dent
96 Refund - No Service
97 Environmental Damage
98 Damage 99 PVC Residue
I'm not sure what they were talking about. I see a nice AU-55-58 coin with no problems. Maybe the grader was having a bad day?
If I cared about the grade I would definitely re-submit this one!
Thanks for playing! Watch for others!