This is an original metal Otto Link Tone Master mouthpiece for the alto sax, serial number B99. This New York vintage piece is table stamped a 4 and measures .062”. It appears to be all original too, with no evidence of being worked on. The bite plate looks great, and there are no nicks or major scratches anywhere. Overall really incredible condition. This is a great piece with that darker early Link sound. It even still has its original cap and lig.