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DC Dec 1991

Detective Comics #639

Newsstand
Detective Comics #639
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16-page Sonic the Hedgehog comic insert included in multiple DC publications, often removed and sold erroneously as a rarer issuance
DC Apr 1992

Detective Comics #643

Error
Detective Comics #643
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Error edition with Mark Badger credited on the cover despite his art not being used - reprinted covers can be identified by a blank space in place of his name
Value unknown - there are no known sales in the past two years of sold data

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