Can anyone tell me what Type of error this coin is? It appears to be a phenomenal error that appears to be a civil war type bayonet going through Lincolns head.
I don't know that all gas bubbles cause a lack of structural integrity allowing them to collapse under light pressure.
Don't think of it as a thin-shelled bubble filled with air but more like an expanding yeasty dough. There's air inside but there is still structure to it -- at least for awhile.
You've got some good pics here so maybe you could put this coin away for a few more years and make a comparison. The bubble may not grow but it may weaken over time.... maybe. Maybe storing in a nice safe place will allow it to forever remain as it is.
If it's not a gas bubble I have no idea what it is. Sorry.
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