2015 shield

check this out, gas bubbles? Die clash?

 

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Looks like gas bubbles to me but I've never seen them on a shield cent.

 

I think those are linear plating blisters. They're definitely not clash marks, because nothing matches up on the reverse to cause them.

 

linear plating blisters is a good explanation, but I am not sure why or how the blistering happens through a field into a design like this

 

I like what Fred Weinberg calls them " Electroplating " error .