Anyone know what this is?

[Eko]

I stopped by the local bank today and got a couple hundred in halfs. 6 40%ers and this 1973 that looks like it has a bubble on it. I know it's difficult to see in the photo, but maybe you get the idea.

I've never seen anything like it. The back of the coin is smooth, (no indentation).

It just looks really strange and I have no idea what would cause it.

Thanks.

 

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[aa battery]

It might of been exposed to a fire or high temperature. I have some coins like it...aa

 

[jewelerdave]

This is what happens when coins refuse to use contraceptives.


I think the problem with the coin is de lamination of the layers. If there was an impurity with the bonding of the copper to the copper/nickel alloy or say a drop of water...well water does not compress. And if air was taped under there the pressure could have pushed it out.

Keep in mind to bond the layers some 150 to 190 tones of force per square inch is needed. All the sudden that little pocket of air or water is kinda strong, and will fight back. Otherwise a chemical reaction could have done it, If the impurity was something that would expand, Like when a bullet is fired, it can press out. Over time just expanding as it has no where to go! like tree roots on a sidewalk. chemical reactions can force things apart in coins too.

What ever happened it expanded after the coin was struck. otherwise the stamping would be all F#&*$ed up.

 

[TxTim]

It might of been exposed to a fire or high temperature. I have some coins like it...aa

Yep.