Following up on what Joe said I doubt that Conly was involved in the 1889 or early-1890 Old Judge production process. Could Conly have bought the rights to the image and produced cards of it on its' own mount---this is possible, but raises the question of why would Conly, a Boston photographer, need to buy someone else's image--it could shoot its' own. I think the most likely scenario is a rebacking, albeit a professional looking one.
I think you are right to look at when Conly used that style mount. Brouthers played in Boston from 1889-1891. However, in 1890 he was on the Player's League team, and I believe Conly did his own photographs of that team. If the mount style dates from 1891 why use a Goodwin image when Conly had its' own 1890 ones or could shoot new ones. Therefore, to me the only hope of the cabinet being a true Conly issue is if it is from 1889. To me this is the second most likely case after rebacking. If the mount style is post-1889 it makes it difficult for me to believe that it is anything but rebacked.
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