error or done by a person?

the obverse is normal...i dont know a thing about error coins so figured id ask people with knowledge

 

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Looks to be a dryer coin, a coin that has been spinning in a hopper mechanism for a while.

 

Welcome rookie, that would have to be post mint damage (PMD). There's no way for it to have been struck like that.

 

ok, well i do appreciate the info...hope you all have a great day

 

A dryer coin would have deformed rims and both sides would have unusual wear (not just one side like the OP states). My guess is someone with a sander or other device ground off portions of the reverse.

 

It appears to me to that a hollow round bit was used. You can see the marks from a tool. I use a diamond hollow bit to make holes in glass , tile, or crystals. They are relatively inexpensive and quite handy. But PMD for sure,
Welcome to the forum!

http://www.ebay.com/itm/10mm-3-8-Ce...229?pt=LH_DefaultDomain_0&hash=item4ab9c5aee5

 

I guess it's what you're familiar with that you makes you think what someone could have used. As a machinist my first thought was a spotfacer tool.:smile

 

Yes, well could be.I am sure there are many other types, but the idea is the same

Jim