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T206Collector...if you provide a context to your question, i.e., give us some reason why you want to know --- do you have one? Is one coming up for sale somewhere? Are you thinking about forging one out of paper clips and snot?
Generally speaking, that card would be worth just a bit higher than what the second highest bidder was willing to pay for it. It's a one-off type situation, to which anticipating bids is not going to get you the right answer.
North of $8,000, I would guess.