Roosevelt dime very unusual and giant cud error

Anyone see a cud error like this? You can clearly see Roosevelt's ear, jaw line, and hair in the top of the cud. What's this worth? The reverse side looks normal (I posted a pic in a later post). I was cleaning out my father-in-law's house and found a jar of old coins where he would stick them whenever he found something interesting going back to 1951.
I am a forensic mechanical engineer and cannot figure out how this coin could have gotten like this. If the coin blank was defective with a thick portion before it was stamped, then I don't see how the die could have reached the rest of the coin face. If I were to place two coins together, one on top the other, and then weld them together, then why is the edge of the raised portion smoothed down onto the other coin? And, what are the chances that someone could line up the top coin perfectly to have the ear in position on Roosevelt's head?

 

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phew...what an error..(unfortunately) but looking at this for PMD I am looking at the bottom of the cud , to the right of "In God We Trust" that corner looks too sharp..almost as if if was added after mintage....my guess 10C

 

Im still new, but doesn't a cud involve the rim of the coin?

 

Yes, you are correct. But many people call any raised metal on a coin a cud. There are several words and terms in numismatics that are frequently misused (like the term 'double die' which is incorrect (the correct term is 'doubled die')).

 

It would really help if we could see a photo of the reverse...

 

I would expect to see a huge crater on the reverse (which means it is PMD).

 

That's some goiter!!!

 

Here is more info on the coin.

First, the edge you are talking about is actually as rounded as the rest. I will take another picture with the light on that area.
I looked up PMD and see you think it might be post mint damage.
Here is a picture of the reverse. It is not affected.
I don't know how a coin could be damaged after minting to look like this.

 

It could have been heated in a fire. When heated a small air bubble can expand and displace the hot metal creating a bubble. When the coin cools the bubble remains.

 

Interesting..... so if this were true, and I took a very fine sharp awl and pushed down on the "bubble", it might break through....
I won't try that until I have exhausted the possibility that this is a minting error.

 

It is apparently a hammered bubble.

 

It looks like someone put chewing gum on the coin and stepped on it

 

seriously, I am looking for sincere replies only....

 

what is a hammered bubble? I don't see how one could heat up one side and melt it while leaving the reverse side intact...

 

I see cross hatching like it was held in a vise.

 

Looks like I will need to take a more closeup, detailed set of pictures for everyone...

 

I'm going with heat damage. The detail of the ear is there which means this isn't a massive die chip (or cud). The surface of the coin was raised as would happened with a bubble formed by heating the coin. PMD.

 

I don't see how this could be anything but PMD. It's definately unusual since the reverse seems unaffected, but there's no minting process I can dream up that would cause that.

 

What does this dime weigh? It may help determine whether or not this is a PMD or an authentic error.

 

I put it on a balance scale against another dime, and they balanced out. Looks like the heat bubble theory might be correct. Still can't figure out how it could be heated so perfectly on one side only, and leave the hair, ear, and outline of the head intact.