Around 15 years ago I played in a band with a tenor sax player who had a metal (silver or aluminum finish) mouthpiece but he used alto reeds. This seems strange to me, but I know this to be true because I only ever carried alto reeds and used to loan him reeds when he needed a quick replacement.
I am curious, does anyone know what mouthpiece this may have been?
Is it possible it could have been a standard mouthpiece with a custom plate designed to decrease the facing profile to one that an alto reed would cover?
I haven't found anything over the years of searching but I could just be using the wrong key words.