Odd 1983 D Roosevelt Dime Mint Error

While going through some pocket change, I came across this 1983 D Roosevelt Dime that has an odd mint error on the reverse. I'm assuming it's  cracked die marks. In my search, I could not find another like this one with a railroad track looking marks between the letters in the word dime. Could this be a new discovery ?  Any help will be appreciated. Thank you.

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