Antique marketplace LoveAntiques.com has revealed a list of the top five most valuable football memorabilia as well as a set of guidelines for potential collectors. The list, created in collaboration with sporting memorabilia expert Chris Williams, puts a football rulebook from 1863 at the top of the list. It was sold by Sheffield FC—the oldest known club—in 2011 for a staggering £881,250. Williams, who is a sports expert and owner of Sportingold, said that while...