Mine is a Yamaha 13E4 short shank.
Have also a look at the Denis Wick cornet mouthpieces. They are also "real" cornet mouthpieces. Here is a link with a comparison chart in pdf :
Denis Wick cornet mouthpieces comparison chart
I took a Yamaha one because it was cheaper and corresponds approximately to what I would have chosen in the Denis Wick line anyways.
Stéphane