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warshawlawThat would be one way of deciphering when in the run your cards were issued. Blank backs or "correspondence" notation backs are the earliest ones.
On an unrelated note, do we consider Zeenuts and Obaks to represent rookies? If so, there are a whole pile of rookies there. If not, what about the 1928 PCL Exhibits, which have Averill and Reese, among other lesser lights.