This pin is 1.25 inches in diameter.  The small stain on this pin NO LONGER EXISTS. It was made by Kim & Cioffi of Philadelphia.  When this pin was being worn by the students TCU was a member of the old Southwest Conference made up of Texas schools and Arkansas.  Alabama, Arizona, Alaska, Arkansas, Connecticut, Colorado, California, Delaware, Florida, Georgia, Hawaii, Iowa, Illinois, Idaho, Indiana, Kansas, Kentucky, Louisiana, Maine, Montana, Massachusetts, Maryland, Michigan, Mississippi, Minnesota, Missouri, Nevada, Nebraska, New Mexico, North Carolina, North Dakota, New York, New Hampshire, New Jersey, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Texas, Tennessee, Utah, Virginia, Vermont, West Virginia, Washington, Wyoming, Wisconsin & Washington, D.C.    520