As the title says, what's one worth?

Depends on whose buying. It will depend heavily upon the condition of the 3rd member. Since that's not the most desirable case (but still plenty strong) I would expect it to fetch $100-$200 if it's nice. My last 8 3/4 3rd member was 3.23 open in a 489 case and cost me $45 plus a $5 or so core charge at the local self-serve wrecker.

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Joshua