I found this CRH today, and It looks to be a miniature cud. I haven't put aside the possibility for a struck through, but to me it looks to be cud. No damage anywhere around the area on all sides and parts of the coin, and it doesn't look to be a plating bubble, but I`m not ruling out the possibility. Too small to depress with a toothpick, I tried. Thanks!
CoinHunter27 Collector of US errors and variety coins of all kinds
"Time is the coin of life. Only you can determine how it will be spent" -Carl Sandburg
I save them basically for educational images. They are neat to show to a new collector. But as far as I know, no one sell them. Note common, but most never see them.
They are caused by accidently dropping them on other dies denting the edge of the die.
This one looks like it fell to the floor and damaged the edge of the die pressing it inwards. (making it raised on the coins) But this is not a cud as it doesn't rise above the rim. (a cud would rise above the rim, from the missing material from the die)