Looks like PMD to me. Something has happened to impact the coin in such a way it has dented the 5 to look as if it includes a 3. If I am seeing what you meant correctly then it wouldnt add any value to the coin at all but is interesting.
I agree with the PMD idea, and would guess that it is Rolling Machine Damage. You can see damage on the tip of the queen's neck, and other lettering looks shiny - like it has also been damaged. P.S. to coin community!
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