I can see why you would ask. Your coin is a Philly mint with no MM and the formation you see on the lower part of Nine, although looks like a D, in fact it is a damage the lower part of the Nine has taken a hit and the metal has been displaced in a circular fashion resembling a D.
It's Post Strike Damage (it happened after it left the U.S. Mint), not an error. The 9 took a well placed hit, causing the metal to get pushed over and flattened. It from Philadelphia, not Denver.
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