1972 Roosevelt Dime blank reverse

I'm at work right now and a friend handed me a 1972 Roosevelt Dime that has a blank reverse. Coin has a slightly raised small circle right in the center of the reverse. All the rest of the reverse is blank. At work so I can't take a picture or weigh it right now.
By this description does this sound like a mint error or post mint where someone machined it with a lathe type devise?

 

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Sounds like a lathe-job to me.

 

That's what I'm thinking. I will try to weigh it and post a picture later to confirm. Thanks.

 

No problem. I'd love to see the pics.

 

Obverse is a normal 1972 dime. Picture of the reverse. Weight is 2.0 grams. Suppose to be 2.27. Not the greatest picture. Sorry.

 

99% chance of a lathe job.

 

Yep, between the low weight and the raised spot, it almost has to be laithed.

 

Thanks guys. Just wanted to be sure before I broke the news to him that this was done by someone post mint. Kinda cool though!

 

I also have a 72' dime with the same description I'm in Tennessee what are the chances

 

The chances are great. There are many coins in all denominations and in all years that have been altered over time by coin vandals

 

From what I have read, it is not possible to have a coin only stamped on one side and the other is completely unstruck, die adjustments aside. It needs pressure from both dies simultaneously to stamp and press the image into the planchet.

It's the same reason why you can't have a totally unstruck coin yet it has a reeded edge.