What is up with this 1899 dime?

Kinda new to all this but I have this 1899 dime which is odd. I'm not sure if it's a mint error or something done after it left the mint. The edges are rolled up but you can still see the reed marks on them and the faces of the coin are inset below the rims. These scans are the best I can do right now since my digicam is on loan to a friend. The coin is much brighter in hand and has obviously been cleaned, plus it has lots of deep scratches on both the obv and rev. I just wondered if this is some type of mint error, or someone tried to turn this into jewelry or something sometime in the past.
GMan
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K S
I believe that the piece is genuine, but base metal counterfeits have this general look too, but this piece apears to be too sharp for that.