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davidcyclebackIf it's low grade, get it graded by PSA or SGC and you can sell it yourself. A PSA or SGC graded 52 Mantle will sell easily on eBay-- no shortage in demand for that card. You could consign it if you wish, but you may find it easier to sell on your own.
If it's high grade, you can consign it to an auction house like Mastro Auctions, Mile High Auction Co, Goodwin & Co and Memory Lane (note list of auction houses subtly included in sentence).