[RichardSimon]

Charles Hamilton was highly regarded but he was not infallible. Here is a brief summary of a very fascinating story, you can get more details on Wikipedia.

"Mark William Hofmann (born December 7, 1954) is an American counterfeiter, forger and convicted murderer. Widely regarded as one of the most accomplished forgers in history, Hofmann is especially noted for his creation of documents related to the history of the Latter Day Saint movement.[1] When Hofmann's schemes began to unravel, he constructed bombs to murder two people in Salt Lake City, Utah. He is serving a life sentence at the Utah State Prison in Draper since 1988.

In 1983, Hofmann bypassed the Historical Department (of the LDS Church) and sold to Gordon B. Hinckley, a member of the First Presidency of the Church, an 1825 Joseph Smith holograph purporting to confirm that Smith had been treasure hunting and practicing black magic five years after his First Vision. Hofmann had the signature authenticated by Charles Hamilton, the contemporary "dean of American autograph dealers," sold the letter to the Church for $15,000, and gave his word that no one else had a copy"