unique quarter with large humps on both sides please help what is this ?

I have this quarter with 1-2mm humps on both sides. There is no indentation on the opposing sides of the humps. The humps are in different places on each side. The image from the die is is not distorted which leads me to believe the humps were on the quarter when it was struck. I work in the production press business and best I can figure somehow slugs were pressed into the quarter before it was imaged. I can't find anything about this error perhaps because I don't know the terminology. Or perhaps this is something someone's done to it and its not an error at all. Any help I can get would be greatly appreciated. I took some decent pics .thanks

 

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Are the bumps solid or are you able to push them down flat and they pop back up?

 

this is damage caused by concentrated high heat like from a torch, causing the outer layer to expand, thus forming the bubble. I bought one from a dealer labeled as an error for $2.50..... live and learn Welcome to CT.

 

They are solid

 

If that were the case wouldn't the image be stretched ?

 

I'm going to attempt to recreate this

 

no. It retains all the design details without distortion. Pretty neat really. Here's mine.

 

Yeah that looks looks like the same effect .thanks

 

If there was actually something inside the planchet, think about what would have happened when the strip was rolled down to blank thickness. Whatever it was would either have been crushed by the rollers, or if it was too hard to crush it would have either down severe damage to the rollers, or it would have been torn out of the strip as the strip passed on through the rollers and the "chunk" didn't.

If somehow you could have a planchet with a chunk of something inside it and it was struck by the dies what would happen? Once agian either the dies would crush the chunk flattening it to the same contours of the rest of the coin, or if it couldn't be crushed it would stop the die from coming together completely causing the "chunk" to poke through the metal, and preventing areas of the coin from being struck up at all. It might also cause damage to the dies.