This particular Mach 7-7 model is much rarer and harder to find as it was produced in between 1984 and 1989 and has features from both iterations of the mach 7-7 that make it unique. It was used fairly lightly over one summer then sat in an attic for the next 35 years. It's in excellent condition because of this, and you'll be hard pressed to find one this old in better condition.