Vintage Dukoff Miami Florida M8 Super Power Chamber tenor saxophone mouthpiece, this one is the M model, giving a darker, rounder, more mellow sound compared to the D model due to its rollover baffle, but still giving lots of projection and body, size 8 measuring 0.109 in my gauge. It is in used condition, plays great, seals, no damage that affects its functionality only normal signs of use, does not have a bite plate but has a mouthpiece patch on it. 

It includes a Francois Louis Ultimate ligature in silver finish, which fits great, and a rubber cap. 

Thanks for looking!