You can find this bubblings in ALL the rings. This is in a '30 style ring. How can be ever die struck?!?!? Same area of 2 rings shows the same macro details and is completely different in micro details: bubblings is different from ring to ring (that's normal for casting pieces).
I repeat: I win nothing thinking they are cast. No one wins nothing. I only find interesing to find real unquestionable proofs, and until today no one ever showed a single one, only theories. Here there are tens of proofs.
PS: can't understand why pictures change size when attached here...