This is a JEWEL model, an entry-level instrument produced by Kawai Musical Instruments in the 1970s at their wind instrument manufacturing factory. Compared to Yamaha's equivalent models, it was highly regarded for its luxurious features, such as a reversed 1st slide, a two-piece valve casing, and solid brass spit valves. The factory also handled OEM production for overseas brands, so its processing technology was excellent. This instrument has been upgraded to the following specifications to allow it to be used without hesitation in current band ensembles. You can enjoy the KAWAI sound. ★ The tuning slide has been rebuilt to a reversed configuration for a stress-free playing experience. ★ A saddle-type thumb hook has been installed on the 1st slide, allowing for pitch correction during performance. ★ A brace has been added to the 3rd slide to increase rigidity, and a stopper screw has been installed to prevent the slide from falling out. ★ The cheap, pressed-type spit key has been replaced with an Amado-type. ★ The finger ring for operating the 3rd slide had some play, so it has been replaced with a Yamaha-made one that can be securely fixed. The listing includes the instrument body only. ◉ The lacquer finish remains at approximately 80% or more, but there are some areas where deterioration is noticeable (near the valve casing). ◉ There are no noticeable dents. ◉ The airtightness of the slides and piston valves is at a practical level. ◉ There are traces of solder removal from the rebuilding process (treated to be inconspicuous). A new gig bag is available as an option. Includes a used mouthpiece for an additional ¥2,500.