San Francisco 49ers - Wikipedia
NFL to allow teams to use alternate-color helmets starting in '22
07-16-10 Issue of The San Mateo Daily Journal, PDF
Should the 49ers Have Alternate Helmets? - Sports Illustrated San
NFL on X: Which alternate or throwback helmet are you most
49ers News – Page 19 – KNBR
San Francisco 49ers Facts for Kids
NFL to allow teams to use alternate-color helmets starting in '22
KNBR on X: The 49ers have made some small changes to their