Buster Posey and Jonathan Sanchez walked into clubhouse managerMike Murphy's office Saturday for a history lesson. Arrayed on atable were five pieces of jewelry, artifacts from the Giants' past. Baseball Hall of Fame President Jeff Idelson had brought threechampionship rings, a watch fob and a 106-year-old pin - gifts toplayers from the team's title seasons in New York. Less than twohours later, the precious items would receive a new companion,after the first World Series ring ceremony ever held in SanFrancisco. Posey and Sanchez still didn't know what their 2010 championshiprings looked like. It turned out they were inspired by the 1933model, a simple, rounded design in white gold. But for the moment,that was a secret. So Posey and Sanchez soaked in the details ofthe trave