Going thru my sisters change jug last night I came across this. While it looks somewhat like a proof that went thru circulation for a long time, the rims look more like a circulation strike. I have not checked my pic yet, but I think you can see what I mean. Both obverse & reverse rims look off even tho they seem to be somewhat squared. The reverse rim looks rounded from 3-9K. It looks like a misaligned die. What are your thoughts? Thanks.
I think it is just an impaired proof. There is a slight finned rim opposite the weakness, so most likely from the strike.