【A. COURTOIS PARIS 9 PM】 This is a mouthpiece for a large-bore trombone made by the French brass instrument manufacturer, Courtois (Courtois) Paris. Judging from its appearance, it's not a recent model, and I believe it's from an older era. It's compact and easy to handle, producing a bright tone with many overtones. Although it's old, it's in overall good condition and can be used without any problems.