Guides are new to me but thought I would share this tad bit of information that maybe alot of people don't know.  More often than not a rookie card ( not just hockey but any of the other sports)  increases in value the most during the 5 year wait between retirement and getting inducted to the Hall of Fame. Also the players second year cards seem to show the largest percentage increase due to the fact most people can't afford the higher end natural rookie card.