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DMcDSteve: Lots of Davids here but I assume you are referring to my post on the First December Pickup Thread following your posting of that neat A's postcard. The link I cited along with a cryptic Q.E.D. strongly suggests that your Obak Byrnes is the same west coast boy who played for Philadelphia in 1906.
http://www.vintagecardboard.com/ref_obkmajors.htm