What's the difference between a "Blow Hole" and a fissure? I know I read about this somewhere, but can't remember (old age, sorry).
I have found one significant error coin in circulation. A 1976 Jefferson 5 cent with an late stage capped die obverse. I got it from the coin return at a grocery store checkout. Even after ~3 years of CRHing two bank boxes of nickels every month.
Guess I haven't read that far, or maybe that's where I read it and now can't remember? Old age is beginning to create problems. My advice to all is, "Don't get old." LOL