Re: Yanagisawa Tenor Sax--Need Info
To find out what a sax will sell for you can start by looking on ebay and craigslist for similar instruments. That's to get started. Ultimately, the instrument is "worth" what someone will pay for it. So you won't know until you put it up for sale.
Another thing to be aware of is that two instruments can have similar descriptions (similar year, similar amount of surface wear) but the condition can be very different. This is more than just dings and scratches. It has to do with the condition of the pads, the adjustments of the keys, worn rods etc. A good player can tell quite a bit about an instrument by playing. But really only an instrument repair technician can tell you what it would cost to bring the instrument up to its finest playability. Since a complete overhaul can cost one or two thousand dollars, the condition of the instrument makes a big difference to how much it's worth.