i'd call it AU55 as well. my only concern (could be the light/photos) is that my eyes are seeing a green tone overall on the coin that could be a light coating of PVC. if it was mine i'd acetone it just to mitigate anything see how it looks and then possibly a verdicare soak if its warranted. this would change the look of this coin so before venturing into this take a close look at it in hand to see if you see the same thing
specifically I'm seeing some imbedded around the neck beads and in the hair under RTY as well as along LIBERTY itself. there are other areas but these are the areas I can see the best