Hi Jesus, Thank you for contacting Mearto with your appraisal inquiry. Monique made inexpensive student saxophones in China; serial number records aren't available online. These typically don't bring very much at auction. Based on the photos and information provided, and subject to examination, this is: A vintage Monique alto brass saxophone designed in France, made in China, fourth quarter 20th Century serial number 970028 with ivory (or ivorine) keys 27 inches long CONDITION: appears to be in generally good condition with some lacquer losses; value assumes this is in good working order with good musicality PROVENANCE: acquired with a storage locker purchase $150-250* *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.