It'll come down to what people are prepared to pay. It's one of those items that can't be accurately priced.
I collect these, I'm not aware of any other serious collectors of these shields, so it'll come down to the owner's hopes and expectations versus a serious buyer and what he's prepared to pay.
Try me
Max
EDIT
Also, I don't think the OP is looking to sell as he has not responded to any of my PMs, and hasn't logged in since the 24th.