What is a Hauser M1 Jig bore worth these days, what would be a fair price to pay

Hello,

Went to an estate sale, and found a nicely preserved hauser M1 jog borer.. Has a rotary table, no spindle that I could find, but the family is going to let me look around tomorrow.. it does have a Microscope centering attachment? Not sure if that is the right name..

Just wondering what would be a fair price to offer.. Any suggestions?

By the way it is in very nice condition. Not banged up at all, everything is very smooth moving..

Thanks
Ray