1957 D Nickel Possible Error Or Double Die. Possible Error Strike

Note that area is not rounded. So it tells me the coin was altered. (how?) If it were a cud the opposite side of the coins devices would be weak in that area.


But it looks like no devices would be opposite that area.

There should be some mark on the edge of the coin?

I greatly appreciate everyone's very helpful and insightful feedback. I am new to all of this and have little knowledge of errors. I began checking all loose change three montjs ago and my lack of experience has cause me to become unnecessarily excitable over findings that proove to be worth nothing more than face value, hiwever, I still enjoy searching for those rare finds and with trial and error I amlearning more and more about the Coin World. Thank you for participating and I appreciate the time each of you took to respond.