1916 Buffalo Nickel - Double Die Obverse!

That's easy.
Buyer thinks it's a DDO.
Also thinks it's a tremendous bargain.

Obviously the buyer didn't think it through.
The seller knows there's doubling; he says so and emphasizes it with images.
If the seller knows that much, then it follows that he knows it's not a DDO.
That's bourne out by the starting bid.

Buyer only knew half as much.
He knew it was doubling; he didn't know it wasn't a DDO.

When the buyer discovers his error, it will be obvious to him that the seller ripped him off (no way will the buyer believe it's his own fault.)

This is a better example of mechanical doubling than the OP's.

 

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silly bidders, without knowledge.

In fact: 47 bids!

I have to put up some of mine!