I could speculate with the others until the cows come home. That said, I think the knife will sell for double where it's at, the "why" is simple: rarity.

While it's NOT everything the seller states in his new auction, it IS very rare and unique.

How much CAN it sell for? Put it this way: if two or three lurkers really want the knife, and any two of the three throw out uber high bids, it could sell for 7.5k or more.

Will it? We'll see....