25 years ago, the 49ers briefly switched to hideous helmets - NBC Sports
What are some of the worst redesigns in NFL History? : r/nfl
Uni Watch's Friday Flashback -- Why San Francisco 49ers' 1991 helmet redesign was historic failure - ESPN
FMIA Week 1: Tagovailoa bursts back as Rams, Browns, 49ers lead surprise-filled NFL weekend - NBC Sports
What are some of the worst redesigns in NFL History? : r/nfl
Friday Flashback: The 49ers' failed logo - ESPN Video
How Kyle Shanahan and the San Francisco 49ers have weaponized the team's history - ESPN
49ers SF 49ers Failed 1991 Logo
Uni Watch's Friday Flashback -- The NFL's helmet shell game - ESPN