That guitar is worth more than $550. For starters, it's hand made and on a par with Sadowsky/Lull. I have both a Blade bass and a Sadowsky.
Not as well known in the USA. In Europe, they're well known. Go to www.bladeguitars.com
and ask Christian for details on it. It looks like it's late 80's or early 90's.
Very nice guitars. Good luck with the sale.