Hi Jon, Thank you for contacting Mearto with your appraisal inquiry. The values Mearto provides are fair-market, for auction purposes but there is a function - if the client ticks the box "not for sale" - where it automatically calculates an insurance value that you can use in lieu of an insurance appraisal (in this case, about $4,000). If you can't figure out how to change the sale status, let me know and I'll ask a client service rep to make that change for you. Unfortunately, it's difficult to know the age of this sax as Yamaha does not publicize their serial numbers online. Based on the photos and information provided, and subject to examination, this is: A vintage Yamaha YAS 875EX brass alto saxophone serial number F36936 CONDITION: unknown but value assumes this to be in good condition with good musicality. PROVENANCE: acquired from original owner $1,500-2,500* *represents a fair-market value for auction purposes; retail or asking price may vary. Please let us know if you have additional items to appraise, and thank you again for using Mearto.