This is a vintage 3-D enameled brass officially licensed NFL belt buckle from Great American Products. I'm guessing it's from the 1980's. Limited Edition #2000. It features the words Chicago Bears with the "C" logo, Bear head and football with gridiron in the background. The buckle measures 3.25 inches x 2 inches.
Made in the U.S.A

http://www.etsy.com/listing/85835740/vintage-belt-buckle-chicago-bears