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barrysloateIf you read the introductory paragraph in the Mastro catalog for the Sergio Delgado collection, you can learn something interesting about defining rookie cards. In short, there will always be debate as to what constitutes a rookie card, and collectors will never be in full agreement.
For example, most collectors feel Kid Nichols' rookie is his N300. I say it's his N172. And I know there are two schools of thought. Jorge Marce, who helped Sergio build his collection, actually devised a point system which took into account several factors in determining the rookie designation. It's worth a look.