I wish we had a little blue book lake NADA for used cars, but we don't.
Bottem line is not what I think it is worth, becasue thaat would be what it is worth to me.
You need to figure out what it is worth to you.
As a general rule, lefties go cheaper than righties...simply less demand.
Right now the entire recurve market is soft. Bows are not bringing what they brough 5 yrs ago. It tends to run with the economy.
I would make the guy a low ball offer and see where it goes.
Do you know how much he is asking, or wanting for it?
One thing to keep in mind is that a bow to a guy is just like his used car...he's gonna tend to think it is worth more than it is.