𝙃𝙚𝙡𝙢𝙚𝙩 𝘼𝙙𝙙𝙞𝙘𝙩 on X: Kansas City Chiefs Helmet history. Not a lot of variation. Two designs not counting the masks. There were some slight variations of the logo in size and design
The Football Helmet. Personal Selection, by Brandon Martin
Career in a Year Photos 1997: A star on the helmet at Texas Stadium
File:Dallas Cowboys helmet 1964.jpg - Wikipedia
File:Cowboys helmet - 1964.jpg - Wikipedia