Simplifying things: Series 150 was 1909, series 350 was 1910, and series 460 was 1911. Any cards with a series 150 back, or released along with series 150 - old mill, EPDG, brown Hindu- would be earliest t206 issue for a player. Thus, if you want the earlier t206 of a player, then the back does matter bc it indicates year of issue.
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