It is a very pretty coin and I think you did well for $180.00. I think that the toning is due to a past dipping (very long ago) and retoning. If a coin is dipped properly, it can retain its cartwheel luster. If it's not completely rinsed, the residue from the dip can cause toning like this. I see the coin as definitely having uncirculated details.
I reiterate that I think you got a very good deal on this coin for $180. Congratulations!
