Is this a real error?

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Not very experienced in errors but this looks wrong for a true printing mistake but....Currently listed on e-bay,I wonder if it's worth $400 in EF if it's a true error.
The front of this note looks perfectly normal.

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It could be, but again to be sure, I would have to see the note in hand.  It could have been caused by a scrap peice paper on the sheet with this note.   However, the piece of scrap would have had to stay on the sheet for the entire trip, for it looks like the note is missing all the layers or applications of ink in the affected area.  What would be really neat would be to have the scrap pieces which would have the missing print on.  

Tom

Well I am the high bidder but i dont think it will sell i think he wants to much  

If you look carefully, you will see the central codebar is half-missing, but the serial number is complete and is over the lower part of the blank area. Therefore, the theory of a stuck piece of paper through almost all of the printing stages holds.  So the piece could have been there until the codebar printing stage, then fall off just before the printing of the serial number.  I think the error is genuine...

If my memory serves me correctly, the code bars are the first to be applied before anything else and the serial numbers last.

Tom

Why is there a faint image of the queen's portrait within that block of missing ink? Is that the queen's image showing through from the front side? The way the left sided serial number appears unaffected (it must have been printed first) is also strange. If this is a bona-fide error, it certainly is one of the strangest ones I've ever seen.

The queen shows through from the other side, just like you can see writing on a white sheet of paper, on the other side.  There also could be slight ink transfer from the neibouring note.

Tom

Selling at $400  :-/ :-/ :-/ :-/ :-/ :-/ :-/

The market is the market  Archey80.Looks like it will go higher.

Question is-what would you sell it for if you paid $400 as the buyer states he did.I know what I'd be asking.