I have a 1975 d mint mark penny that's missing the U in United and the date and mint mark look off. I was wondering if this was unique and worth anything.
I agree, a partial grease-filled die, and as others, will reserve comment on the described mintmark until we can see it. It is always good practice to give us whole photos of both sides of your coin anyway.
Probably a grease strike through or Die Deterioration. Only valuable to those that collect this particular variety. Try to sale it and see if it generates an interest. Check ebay sold section for pricing.
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