As a child they called her Lumpy...
Broadstruck
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That looks like it hurt! 
Just surfing eBay and haven't seen one of these in a couple years.
Not rare, but about as scarce as a sizable lamination.
It's a planchet mixture impurity issue as air was trapped making Ms. Liberty seem like a gassy gal 
To Err Is Human.... To Collect Err's Is Just Too Much Darn Tootin Fun!
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I have a Morgan with a similar gas occlusion on the reverse
...so the gas (air) in that bubble is 182 years old? Maybe it's good that it now resides encased in plastic. Cool coin none the less.
"Keep your malarkey filter in good operating order" -Walter Breen
Don't think that I have seen that before.
It looks like a brain tumor.
Doesn't happen anymore as the mint now adds a little Beano Before.... No Gas After
I have not seen that before..... certainly an oddity.... Cheers, RickO
IT'S NOT A TUMOR!
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That's wild
As a child they called her Lumpy...
Lawrence "Lumpy" Rutherford
I always thought that it may be possible to 'create' errors like this with the addition of extreme heat. Of course, that trapped gas didn't expand under it's own volition.
She must of "struck" her head pretty hard.
Paper money eventually returns to its intrinsic value. Zero. Voltaire. Ebay coinbowlllc