Im pretty sure it is custom.
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The logo for the Chicago Bears is written in the font OL London Black. The link to the font is: http://new.myfonts.com/fonts/ortizlopez/ol-london/ollondon-black/
"A Chicago Bears hat is designed with the official colors of the Chicago Bears football team. The hats are navy blue, orange, and white. They usually are embellished with an orange 'C' outlined in white on the front of the hat."
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There are many helmet dealers in the Chicago area, but the best place to find a Simpson helmet would be to look on eBay for they are cheaper than any of the helmet stores in Chicago.
ARIAL
Chicago Bears
The bears where the Chicago Staley's
The Chicago Bears team is based in Chicago, Illinois.
Chicago Bears
Chicago Honey Bears was created in 1976.
The Chicago Bears are a professional football team in the National Football League.