Found this morning... It doesn't look like the other Cuds I have found , but it does involve the rim.
Your coin is a match for Precud: RCD-1c-1953S-02R http://cuds-on-coins.com/lincoln-cent-1909-1958-rcd/
Me and my dyslexia . . . my mind puts words together strangely and when I read "reverse cud" my mind went to, "what the heck is that?" A cud in reverse? Then I realized it was a cud on the reverse of a coin. Silly me. LOL