What do you think happened to this dime?

I found this convex-curved dime when I was a kid. While organizing my office, I came across it today. After taking a good look at it, I started to wonder how the dime became curved. The thing that puzzles me is that there are no scratches or marks that would indicate it was struck using something such as a hammer. Note: I had difficulties photographing this coin to show its curved shape. The shape of this coin resembles the 2014 $1 Baseball Hall of Fame commemorative. The difference is that the center is flat. Looks more like a bowl.

 

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Spooning possibly?

 

It is possible for a coin to "Buckle" or "Cup" due to being struck. It has something to do with the annealing process. Hard on one side soft on the other . Stress in the Planchet. I really is hard to say why this happens.
I believe it is called Impact-induced Warping.
http://www.error-ref.com/impact-induced-warping/.

 

@alurid Thanks for the link. It does look like impact-induced warping, i.e., curved along the rim and flat in the center. Is this dime worth more than $0.10?

 

I do not know what it may be worth. I am not sure that it is a mint error.
I just wanted you to have information so you can decide what it is.
There is some finning along the edge of the reverse at 9-11 oclock that looks like damage of some kind.
It may have been better to post in the Error Forum.

 

Sounds good.

 

This dime did not leave the Mint like this, and annealing (or over-annealing) would not cause a planchet to buckle, which is done before the die striking.

The details are much too strong and are neither stretched nor compromised. The die itself would have to be convex to strike details on an inward curved and concave planchet, which is not possible.

This dime became cupped by something after it left the Mint, and thus what you are seeing is damage,

 

Hey,
I have one also, have had for many years and am just looking more into it now. Have you found out anymore info of the dime since these post? Mine is also a 1981 but D mint mark

 

here’s images of my coin for reference. Looks like the identical thing happened to it as the one posted here.