To me, that appears to be a normal 1959D mintmark suffering from Die Deterioration. I see no signs of a spread or notching. Now I will wait for the experts to confirm or deny my opinion!
I have a hard time telling the Tilted RPM's especially on a worn MM from a photo. Go to coppercoins.com and try to match up markers from the 59-D 1MM-026 thru 1MM-050 if it is one it would be in that range
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