I want to buy an old Adam Schaff upright piano from our Aunt. I don't know what to pay her and make it a fair price. Some of the cabinet has had some mild water damage. It comes with a round stool. I doubt that it has been maintained for years. In getting the serial number, the inside is covered in dust. The serial number is 30754. Can someone give me some sort of an idea as to what to pay her? Also, what year is it? Thanks, rec22