Here’s my old vintage Dukoff power chamber baritone sax mouthpiece D7 opening .. I got this in the nineties when I worked in a London music store..has been well gigged but looked after..rails and tip are good but alas the bite plate has seen better days.. easy to replace but never bothered me ..feels fine with a patch which I use these days. Original tatty box and I’ll throw in a rovner ligature to the buyer ..please see pics .. these pieces are beautiful to play and surprisingly flexible tonality wise and a funk to pop monster