Whats a worn die strike exactly? Sorry I am new to coins and learning as I go along. Any info is much appreciated to expand my knowledge
When the Die that is used to strike the blank planchet is overused (worn die) then you have Die Deterioration which results in Die Deterioration Doubling. Worthless Doubling.
As paddyman said, DDD from a worn die. This is actually very common on steel cents, I believe it's due to the hardness of the steel planchets. Also... Doubled die, not double die Cent, not penny