Saxophone Collectors Check This Out! King Super 21 Silver Sonic Professional Alto Prototype "One of Only Ten Ever Made!" Features: Solid Sterling Silver Neck and Bell Extra Fine Detailed Engraving Custom Fitted Hardshell Gig Bag Here's the story on this horn as I understand it: King wanted to design a new high end sax based upon the great old Super 20 horns like the one Cannonball Aderly played. They made 10 prototype instruments, 5 for internal use and 5 for artist evaluation. The project was going well and everyone loved the horns BUT King was bought out by Selmer. Selmer didn't want to make a King sax that rivaled the Super Action Paris instruments so the Super 21 project was canceled. Out of the 10 saxes King made, only a few escaped to the outside world. Now in this auction you have an opportunity to own a very rare piece of saxophone history! This sax is in MINT ++ condition. It may have never even been played!