The Black Diamond
George Williams, aka "The Black Diamond," was an African-American performer whose act consisted of showing the enormity of his mouth, and the things that could fit in it, including billiard balls, etc.
Performing in the 1890s, and into the early 1900s, Williams was a precursor to "Three Ball Charlie" who performed from the 1920s and 30s. Williams performed in dime museums, with minstrel shows, and also worked as a street performer, sometimes getting arrested as can be read below in contemporary newspaper accounts.