Looks more like Die Deterioration on the mint mark.. IMHO I'm not seeing a Die Crack. Looks more like Scratches and a gouge.
RPMs aren't possible after 1990 due to the Mint incorporating the mint mark directly on the hub that makes the die.
Suggestion.. Create your threads over at the Error Coins forum.. not the What's it worth forum.. Even if you had a Die Crack, Die Chip, Misaligned Die Strike or a minor RPM they really don't have any premiums or maybe very little premiums.