The Big Diamond 1929

Tom Mix starred in this late-silent Wild West melodrama from poverty row company FBO as a ranch foreman assigned to escort his employer's daughter (Kathryn McGuire) from the big city back to the ranch. The girl, Ellen, is carrying the valuable Regent diamond, and the pair become the target of a gang of thieves led, it turns out, by Ellen's former fiancée Rodney (Ernest Hilliard).

Cast:

Tom Mix
Tom Markham 

Tony the Horse
Tony (as Tony the Wonder Horse) 

Kathryn McGuire
Ellen Brooks 

Frank Beal
George Brooks 

Martha Mattox
Aunt Effie 

Ernest Hilliard
Rodney Stevens