1921 Cal Tek vs. USC Official Football ribbon

This is an officials field ribbon from 1921, for football.   It says "Official, Cal Tek vs USC, Oct 8th 1921, Bovard Field"  This ribbon is from before the Coliseum was built, and USC played their home games at Bovard Field.   USC won this game 70-0.   It is in excellent condition, and an extraordinary piece of USC football history.