This is a Marcinkiewicz horn mouthpiece. I've forgotten the details, so please check the HP. It's a rim change model. https://www.marcinkiewicz.com/ Rim 17.910mm Rim Width 3.75mm Cap depth 25.200mm Bore 5.410mm The rim is gold-plated, but the color is faded. No dents, almost no scratches. Case included.