This is a 1940’s vintage Otto Link New York Tone Master. These mouthpieces have a large chamber, but play with a little more edge than their predecessors. These mouthpieces were played by a number of tenor giants such as John Coltrane, Hank Mobley, and Ben Webster to name a few.
This piece has been refaced at some point, but I am unsure by whom. The rails and tip are very wide, but measure true.