Privacy Policy. Tempo : Student line, later renamed model 606. Have one to sell? Mouse over to Zoom-Click to enlarge. King Tempo 606 Trombone USA with mouthpiece and original hard case. All functions of this trombone have been tested and work perfectly. It offers a.500" bore with a responsive 8" seamless bell for easy projection and control. The lacquer and nickel-plating are also wearing slightly. H. N. White Co. -- King Serial Number