Seattle Seahawks - Throwback Uniforms
Photo gallery of 49ers new throwback alternate uniforms for 2018 - Niners Nation
Logos and uniforms of the San Francisco 49ers - Wikipedia
San Francisco 49ers reveal black alternate uniforms during draft
Photo gallery of 49ers new throwback alternate uniforms for 2018 - Niners Nation
NFL alternate helmets: Tracking NFL teams' secondary lids for the 2022 season
San Francisco 49ers - Wikiwand
New throwback uniform debuts at 49ers' State of Franchise event
NFL Teams Debuting Alternate Helmets, Jerseys for the 2022 Season – NBC Los Angeles
Arizona Cardinals unveil new uniforms for the 2023 season
49ers First Alternate Uniform
Colts unveil new 'Indiana Nights' alternative uniforms, black helmets
San Francisco 49ers unveil alternate uniforms on Snapchat - The Washington Post