Scott- I collected 19th century baseball photography for about twenty years, and I never came across an original tintype from the 1880's that pictured a major league ballplayer in full uniform such as the one you have. Given that fact, plus its originating from the Vermont find, and I would say with near certainty it is not period. Virtually every photo that came out of that find was reproduced, so the likelihood of yours being ca. 1888 is not good.
Of course, you should still try to get some additional opinions.
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