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PaulMany of the 1902 W600s say "1902" right on the front. Maybe all of them do. I'm not sure. Perhaps Scott Brockelman or Jerry Spillman can shed some light on this. In any case, I doubt Sporting Life would have continued using the "1902" designation on the front in later years. So, if Matty is one of the players that was issued with "1902" on the front, it would be easy to tell if you had a rookie.
Here's an example. The scan's a little blurry but it says "First Baseman of the Philadelphia (N.L.) Club of 1902."