Old Central's bell clapper was considered a trophy in which rivalry between Oklahoma and Oklahoma State?
Old Central:  Old Central's bell clapper once served as a traveling trophy in the Bedlam Series athletics rivalry between Oklahoma State University and the University of Oklahoma. Bedlam Series: The Bedlam Series refers to the athletics rivalry between the University of Oklahoma Sooners and the Oklahoma State University Cowboys of the Big 12 Conference.
Bedlam Series