The Philadelphia mint produced over 10 billion small date copper cents, so it wasn't an accident. The 1982 D small date one is the only one that's valuable because its the only one that didn't produce copper cents at all, unlike the other mints and date varieties.
Because they didn't strike any of the small date copper cents from Denver. Only one known. (Probably a mint employee created one and tossed it into the bin?
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