Sorry to say that you probably won't be able to get more than a couple hundred $ or so for it. With vintage anything the price goes up according to how complete and original the package is. Martin saxes from that era had matching serial numbers on the neck coresponding to the body. The case, while not quite as important, still brings a few extra $. The same goes for the adjustable thumb rest. You can always put it up for sale with a "Best Offer" on an instrument-trading site. Who knows? If the body is still in good shape, someone with a similar dated horn might just buy it to use as a back-up while their main horn is in the shop.... Good Luck