Yes its true it took me nearly 30 years to finnally get a 1971 D silver mint error NGC 61 and a 1977 D silver mint error AU58 , 71 1 of 2 known to exist, 1977 D 1 of 10-12 known to exist. A 1977 D silver mint error IKE dollar PCGS58 1 of 15 known to exist. Do not have the 1974 D or the 1976 D IKE silvet mint error 30 known for the 74 , 2 known for the 76.
I don’t see any error. There’s a 74-D DDO (doubled die obverse) but yours isn’t one of them. Can you be more specific in your question?