Anyone know what causes this?

[iammoleman2]

I found a Kennedy half with an odd bubble on the obverse. I have no clue how this could have occurred. The reverse shows no damage. I don't think it is a CUD? Any help is appreciated.

 

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[pat-tekker-cat]

I think Kennedy needs some iodine. Ya don't see qoiters like THAT, nowadays.

No clue, as you say the back is unaffected, other than, possibly a micro piece of trash blew in during the melding process, and whatever impurity is in there, has corroded and/or attempted to come to the surface.

 

[DeepseekerADS]

Hmmmm..... No idea, but I'm thinking this is post circulation. Wouldn't the counting machines in use have kicked it out?

 

[coinsareawesome]

Is there a hole on the reverse?

 

[iammoleman2]

I also considered a contaminant inside the planchet but the guy at the LCS thought an expansion like that would cause a surface crack. Doesn't mean he is right, just his opinion. There are no cracks and no reciprocating bulge on the reverse. It's just baffling. And if there is a containment wouldn't that be a mint error as it was most likely present in the planchet?

 

[DeepseekerADS]

From the pictures the coin appears stained, perhaps from heat.

 

[Loco-Digger]

A fire can cause blistering of coins. I have a few clad quarters and a peace dollar that have been blistered by fire

 

[Nitric]

I had the same thoughts as the above when I saw the pic of the reverse...Heat. It bubbled between layers, maybe from a little air pocket that expanded when it got hot.

 

[enamel7]

Damage due to heat.

 

[iammoleman2]

Thanks for the input everyone.