What we know today as the modern NFL started kicking off in the early 1980s. Future legends like Joe Montana and defensive heroes like Dan Hampton were just beginning their careers. The 1981 Topps football card set capitalized on the sport's growing popularity, hitting the jackpot by including the iconic rookie card of future Hall of Famer Montana - there's no question he's the star of the set, but there are other legends included here who shouldn't be overlooked. Like most cards produced during this era, collectors have to be on the lookout for centering issues and print defects. Also of note is the fact that this set was an unlicensed product, as Topps didn't yet have the NFL license. Let's have some fun and take a closer look at an all-time classic set.…