Mark Hoffmann Forger - Murder Among The Mormons

(2002) The penny, a 1959-D whose reverse side includes the wheat stalk design that was discontinued in 1958, was investigated last spring by the Counterfeit Division of the U.S. Secret Service, which declared the coin authentic. The testing included examination under a 200-power optical scanning electron micrograph, according to Coin World magazine.

"The coin it talks about is one of my forgeries," Hofmann wrote to his family in the July 24 letter, which included a copy of the magazine article. "It is struck from dies I made with an electroplating process."

Ira Goldberg, co-owner of Ira and Larry Goldberg Coins and Collectibles Inc. of Beverly Hills, Calif., which is set to auction the penny on Sept. 23, doesn't believe Hofmann is telling the truth in the letter. "Just because he said he made it doesn't mean by any stretch of the imagination he did. Here's a guy sitting in prison reading Coin World. . . . He's a known liar. I take it with a grain of salt."

"If it were electroplating, you'd see a seam," says Goldberg. It would also be detectable by measuring the coin's specific weight and gravity, he says. "I think he's trying to get publicity."

Also Mark Hoffmann -

"According to Mark Hofmann, while still a teenage coin collector, he forged a rare mint mark on a dime and was told by an organization of coin collectors that it was genuine.
Hofmann decided that if experts said the coin was genuine, then it was genuine, and he was cheating no one to whom he sold it."

Does anyone know more of Hoffmann's coin forgery?

I picked up on this after watching the Mormon Murder documentary, which I remembered bits and pieces, but nothing about coin forgery.