Hofmann is also believed to be responsible for a “mule” 1959-D Lincoln cent with the wheat reverse[0]. (1959 was the first year of the Lincoln memorial reverse, so no more wheat cents should have been made.) The coin surfaced in 1986 and was authenticated by the secret service, yet no one in the coin business will either condemn or authenticate it. The coin has been sold several times since then for larger and larger sums of money.

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[0]: https://www.pcgs.com/news/the-mystery-of-the-1959-d-mule-lin...