This is a vintage hard rubber Florida vintage Otto Link "Slant Sig" mouthpiece for the soprano sax. You don't often see these Florida Slants for soprano, especially in pristine original condition!
This piece is stamped a 5* and is all original, measuring about .062". Physically it has a couple scratches right on top from a previous ligature but really no other wear of note. The beak shows no indentations and the original tip and rails are perfect. A really nice playing piece with a warm sound and great projection.