Where did this come from?

Killer6 said

Piece of a repair-attempted rear main seal retainer is My best guess. Slanty oil pump external...

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the first time I changed oil in a new 1969 coronet 440-4 speed ,rt , something started blocking the drain hole , reached in w/ a wire w/ a hook bent on it , and pulled a gob of steel wool out --sabotage from the factory , no doubt !