PRESS PHOTO BY TIM GILMANAuthor Dave Seidel of Allentown signs his latest sports book, “The Uncrowned Champs,” for MaryAnn Belchunes, and her grandson Reagan Kaar, both of Bethlehem, the Saturday before the Super Bowl. Seidel said his second book about professional football is about “how the 1963 San Diego Chargers would have won the Super Bowl.” Seidel, who has a brother living in Bethlehem,