It sounds like you are well on your way in the illness...errrr....hobby. As you can tell sometimes you do make great finds. One hint I can give is that if you ever buy an updated issue of a book be sure to put the old issue in your car as a travelling reference. And if you don't have the reference I would rarely be afraid to spend $10 on two unknown chips. It is only $10 and and the worst you would probably do is get two traders. Keep up the good work.