I have a custom Hammond Design tenor mouthpiece for sale that is in between a 12ML and 12L. Gold plated rim.

$175 shipped CONUS.

Condition: Very good. Top of rim and shank are flawless; there are a couple very minuscule dings on the outer slide of the rim - very shallow, barely noticeable and plating still intact. PM for more pics.

Specs:

Rim:

Inner Diameter - 25.69mm (Ever so slightly larger than stock 12)

Outer Diameter - Wider than stock hammond tenor O.D.

Contour - More flat

Bite - Smoother than stock

Cup depth:

20thousanths deeper than ML, still shallower than 12L

Throat: .278 (.004 smaller than stock hammond 12ML/L

Backbore: Stock