I had one of the fretless ones a few years back (still have a fretted with my son). I got the shell as a project, and fitted it with a Schaller bridge and a custom one-off Lollar pickup. With those ultralite tuners, the bass is probably light as a feather. I know mine was. I gotta say that thing came in under 6 lbs. As far as the scale, I never really measured. I put a set of long scale TI flats on it, and had leftover string galore. My neck was unlined, but I don't know if they also offered a lined fretless. If they didn't, someone spent a lot of time and money on a bass that will probably never recoup his investment. At the price he's got it now, I'd go for it. I sold mine about 4 years ago, and got $450 for it. These don't come up often, and I want to say that $300 is about the norm, if it's in good shape. The fretted one I got was pieced together, and I ended up spending $200 for it. It's not nearly as nice as the fretless project I did.
The neck on the listed bass looks like my fretted, and it's not near as light as the fretless was.
Here's what mine looked like: