Don’t know the value, you’ll need to look at others and see. Selmer is still one , if not the best sax maker in the world. I would first just try playing it to see how it feels. Not much else really matters. If there’s a ding on the body it can be fixed, if there are leaky pads or bent or broken rods they can be fixed etc. Much lilke a car, if you can find enough problems with it from a repair man then maybe get the guy to lower the price. A good repair man can find things we might not.