And maybe a rim to rim die crack on the obverse. Interesting reverse too, hopefully someone knows what that is.
It's a lamination flaw. It's where a fragment of metal has peeled off, or in the process of deterioration [separation]and depends on the amount of service to deterioration.
By definition, is that considered a mint error? I'm curious since it's deteriorating after it has left the mint.
A defect in the planchet. Yes a mint error in the process of the planchet, but not the actual coining with dies. Does this help. Look at how the process of planchet are formed/made.
It’s a nice find but definitely isn’t “worth encapsulating” as far as I’m concerned. The patina is off so it’s obvious the coin has been cleaned at some point. It wouldn’t even straight grade if you sent it to a TPG. Save your money.