The plating on the surface has been removed, but the interior remains completely intact. This is bare brass processing by a craftsman, so a strong oxide film has formed. While it may appear used, the condition is good. This mouthpiece produces a mellow, aged sound through processing, while still having power. It resonates well and is stress-free. ■ Overview ・Design Features: Warm, classic sound due to the deep chamber and low baffle. "Secondary Window (double window)" design creates rich overtones, and phasing design applies the golden ratio. ■ Sound Quality and Playability ・Timbre: Dark and warm sound reminiscent of 50s-60s jazz. ・Ease of Blowing: Low resistance, easy to get used to even when switching from rubber mouthpieces. ・Projection: Vintage-like, but cuts through even in a big band. ・Flexibility: Capable of expressing a wide range of musical styles.