Dunlavy SC4 Speakers

Does anyone know what the value of a used set of Dunlavy SC4 speakers would be? These are the original SC4's early run I believe. The reason for the question is that I have a line on a set and I'm willing to pay fair market value which often is determined by a speakers popularity and not actual worth. I'm trying to determine a base line price with the seller without out getting into these are the best speakers ever made and that makes them worth a million bucks!

Thanks!