I would not value that coin as much more than £12 or so , you say lustre is still present , its not clear on the coin at all if it is or not . This is quite a common problem with some copper and bronze coins i have put many a coin on ebay and had to say that it has lustre traces but they don't show on the scan. Try getting hold of a nice coin in the £60 to £100 price bracket and trade this one in. I agree coin is gvf and lightly cleaned.