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Todd (nolemmings)The Baseball Encyclopedia lists trades. Roush was traded from Newark of the Fed Lg to the Giants for cash on 12/23/1915. He was traded 7 months later to Cincinnati(with Matty) on July 20, 1916. Thus, if he is designated as being with New York (I have not seen the card to comment on his uniform), the card seemingly would have been produced and issued in that 7 month period.
Interestingly, Mordecai was re-acquired by the Cubs on February 10, 1916, along with a slew of other Chicago Whales (or would that be a pod?), again for cash. Assuming the m101-5 set was produced all at once, that would appear to narrow the production date to sometime between February and July, 1916. If we had more examples, we might confirm this or even narrow it further. Have you seen the team designations and uniforms, for example, on the m101-5s for Buck Herzog and Red Killefer (the other players involved in the Roush trade of July, 1916)?