You need the serial number of the Yamaha saxophone. The most common place to check for it would be under the thumb rest. If not check inside the bell or around the rim or any documentation with it. Then I would contact Yamaha Band Orchestral Division at 616-940-4900 or check their website. With the serial number they can tell you.
Locate the serial number on the Saxophone. It should be inscribed somewhere on the metal. Contact Yamaha by phone, or possibly on the web and ask to look up information pertaining to that serial number.
