The Vincent Bach Corporation 12c mouthpiece is a small bore small cup, small rim tenor trombone mouthpiece. This was the first mouthpiece I used, some fourty-six odd years ago. I have no idea how I managed to hold on to it.
The attention to detail and the over all aesthetic are lovely. Classic looks that have been copied countless times
You can still get the Bach 12c. It’s a great small mouthpiece, and a great first mouthpiece.