Pennsylvania Statehood Quarter Error Shadow Reverse

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From error-ref.com, a website created by some of the foremost error experts in numismatics such as Mike Diamond, BJ Neff, etc...

 

yeah thats why there pretty common but that coupled with thermaldynamic effects might explain why it might happen after alot of extreme ware(as they say)/friction/heat build up towards the end of a long run. Most coins dont show this but alot do have similar effects wich could mean thermaldynamic effects do play a role in this feature becuase it doesnt always mimick the device of the obverse sometimes its just a slight depression near the edge of the coin wich makes me this thermaldynamics has a role in this and i bet if you ask a mint worker they might tell you some coins do come out of the press pretty hot.

 

Jallengomez hit the nail on the head, this is caused by a phenomenon called progressive, indirect design transfer.

 

I concur

 

What I said sounds an awful lot like Mike D's description. It's pretty straightforward.

 

This is the gadget that best helped me understand the effect.

 

Here's a nice one.