This is the "Personal" model metal tenor mouthpiece which they are no longer making. The facing is unknown as the previous owner has cut off some of the shank that would have indicated the facing number. I wonder if they did so wanting to play this with an alto since it is about the same length as a Dukoff alto mouthpiece.
The bite plate has some deep teeth grooves, but the tip and rails look good as you get on a Dukoff such as this.
No cap or ligature included. We can recommend some ligatures if you need.