Thanks for the replies. I'll get some better closeups later but it doesn't look like a crack to me. It looks like a folded over struck through foil. There is debris buildup to the outside but not on the inside which I think precludes this from being a die crack regardless if it touches the rim.
What I'm not sure is why "03R" is considered a
Retained Cud since they seem to show the same "folded" phenomenon.
The shape and location is puzzling since it looks so much like a pre-cud.

"Pride is yoked with callous behavior, as humility is with compassion." St. Gregory Palamas
Top Finds - 1969-S 1c FS-101
http://goccf.com/t/477681 1976 D WQ FS-101
http://goccf.com/t/382777 - 1968 D 1c FS-801
http://goccf.com/t/422254Cool clashed dies - 1972 D 1c
http://goccf.com/t/429855&SearchTerms=CCLStruck-In Rim Burr - 1969 S 1c
http://goccf.com/t/425587&SearchTerms=burrFloating (Type II) Counterclash - 1978 D 1c
http://goccf.com/t/434991&SearchTerms=1978