Getting ready to sell my sons Saxophone. Bought in 1984, it is a Selmar Omega Alto Sax with serial number range 8205XX. Says Selmer USA on the bell, no Omega etching, mouth piece cover says Henri Selmer Paris, Made in France. From reading some older forum's, I think I might have something of value but don't want to overprice either. Any thoughts? Thank you, I'm new at this forum stuff.