Very Unusual Roosevelt Dime!

The coin does look like it was heated and a gas bubble this size would also effect the rim. I think this is an indent error. Your coin stayed in the coining chamber after the first strike and then a second blank fed in part way over your coin for the second strike. The collar maintained the rim on your coin. The second coin would be a off center strike with the off center obverse on one side and a very mushy almost blank off center reverse. It's hard to see in your picture, but I think I see the almost obliterated details of the back of the head and the date on your coin.

I would think the affected surface would retain some of the original coin details in that scenario pyrbob. My alternative guess is this was simply a bad blank, that was upset properly and then struck properly. In order to tell that for sure I would need to see a clear picture of the reverse. The details on the reverse area which overlaps that missing chunk should be weaker. As to what caused that chunk of material to be missing from the blank, I'm not sure.

Exactly, what Mike said! Nice coin!

I was wondering what photos people were seeing until I got to Mike's post.

This is another case of someone coming around for knowledged advice and instead is getting guesses that appear to be knowledged advice. PLEASE....if you aren't certain of what someone's coin is, please state so! It took nine posts for the originator of this thread to get the correct answer!

I hope I'm not the first to thank you guys for your expertise in helping my family and I learn the approximate value of our unusual dime . Prior to looking up this forum I can honestly tell you that My knowledge of currency was limited to the difference between a penny and a $100 bill . This may be everyday stuff to you but for us it was extremely exciting to learn that a Dime , not just any , but one indented by an unstruck planchet could have a value 500 times face value. It was reassuring to have knowledgable coin people like Bill , a columnist for Coin World or Mike Diamond ,president of Coneca and even CD who showed true concern that I was not being provided the correct info quick enough . Not only did you answer my question but you all provided an in depth education that will be with me forever . Thanks again for providing a great forum . , Alan

I don't think the slight irregularity in the internal margin of the indent is significant. Under high pressure, metal can flow in strange ways. However, it's possible that the planchet was damaged. Your other comment about the "high rim through the center of the obstructing planchet" is confusing. It looks like a typical example of a coin that was indented by a planchet and that was struck fully within the collar. I don't think this is an indentation from a partial, uniface die cap (although I cannot entirely eliminate that possibility). If it had been struck through a partial uniface die cap, I would have expected a stronger ghost image of the obverse design to have bled through.

As to value, I'd estimate $35.

If it was a defective planchet with an elliptical void in the obverse face, then the reverse face would be weakly struck.