Very nice sign.  I've seen it before but I have no idea of the value.  You might post a photo and your question of the NFLCC Facebook page.  (77) NFLCC Message Board (facebook.com)

It's a modern sign.  There is a company somewhere in the Indiana or Ohio area faking the crap out of various sporting related companies signs.  They are all 48 x 24.  Last year at the Milwaukee show one room was selling all kinds of them, various companies, makers.  I've been an antique advertising dealer and collector for over 30 years and have owned at least one example of nearly every early fishing tackle related sign, poster or calendar at one point or another.  The ones I haven't owned, I have seen and handled in person.  There is some company in India faking the old porcelain on steel signs, a much more arduous process than just litho on metal like this sign, and yet they are doing it.