I don't know for sure, but I'd guess $500.00-PLUS!
These are getting very scarce, that is to say the people who have them don't want to sell them!
The 600's are nice, light, quick handling and reliable!
I had one for a lot of years, in 6mm Rem., but I gave it to my son quite a few years ago! When I did that, I also threatened him if he ever sold it!