San Diego Chargers - Wikipedia
The FAILED San Francisco 49ers Rebrand from 1991
Uni Watch's Friday Flashback -- Why San Francisco 49ers' 1991 helmet redesign was historic failure - ESPN
The 49ers' lost year: A nightmare logo, three QBs, blood, broken glass and Hall of Famers departing. Remember 1991? - The Athletic
Throwback uniform - Wikipedia
Uni Watch's Friday Flashback -- The NFL's helmet shell game - ESPN
How Kyle Shanahan and the San Francisco 49ers have weaponized the team's history - ESPN
The 49ers' lost year: A nightmare logo, three QBs, blood, broken glass and Hall of Famers departing. Remember 1991? - The Athletic
Uni Watch's Friday Flashback -- When NFL teams went helmet crazy - ESPN
Friday Flashback: The 49ers' failed logo - ESPN Video
What are some of the worst redesigns in NFL History? : r/nfl
How Kyle Shanahan and the San Francisco 49ers have weaponized the team's history - ESPN