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MW In addition to the two players pictured below, I also have William Carrigan (Mgr., Boston American) and Joe Wood (pitcher, Boston American). Based on the careers of these four players, I would date this issue as 1916. I also have some information that this might be a baking issue, but beyond that, I have no idea. The cards measure 2 3/4" by 5 7/8" and all have a blank, sepia-toned reverse. There is also a dotted "cut-line" that appears on the bottom edge of each.
Additional notations:
Copyright -- Underwood & Underwood
"Bradford & Co. Pub. St. Joseph, Mich." -- Printed along the bottom