Lots of AH can sell this for you. The reason I suggest Hunt is that they've dealt with these. In fact, they have one in their current auction:
https://huntauctions.com/live/imagev...=271&lot_qual=
Not apples to apples because the one at auction is autographed, which is a huge thing on a Clemente item, but it's at $9,300 with 5 days left to go. With the price that high and so much time left, I expect it to go north of $20k and maybe much more. For fun, you might want to track it.