Block" at Cold Mountain, there is a small  black clock. It is next to the telephone, and faces the wall behind  the desk. When Wild Bill is brought into the cell block and the  brawl ensues, the clock is knocked off of the desk. This action  shows the clock clearly, and it is a Westclox Big Ben "Style 5". The  Style 5 was designed by Henry Dreyfuss and introduced in 1939.  Production continued until 1949. Since the movie takes place in  1935, that particular model of clock should not be there (especially  given how worn it looks).