Here is a vintage, 1980's Otto Link Super Tone Master baritone mouthpiece. It is stamped 5* and marked " 100 EF". This piece measures .098" on my gauge.
This piece comes from a retired musician who at some point sent this mouthpiece to Eric Falcon who opened it up about a half size, thinned the rails and replated it in silver.
STM baritone pieces work well on vintage horns or when blending in a section.