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I would sell it as is
I would break the coin out of that holder, throw the holder away, and forget that holder ever existed.
Never buy a coin that isn't graded by PCGS, NGC, or ANACS. For the most part, every other company has no standard for grading coins. In fact, there are some that will grade counterfeits.
If you bought the coin to keep it, put it in a cardboard/plastic holder. Otherwise, if you plan to sell it, just sell it raw.