I also say that this is the perfect piece to mess with if you are interested in learning something about mouthpieces. I've had success with
mouthpieces that were in far worse condition. It's just a matter of how much time you want to spend on it. Since you can't hurt it, you could even "free hand" an improved facing. Just sandpaper and a flat surface. Better would be getting some basic equipment so that you have a measured reading of what you are doing.
One of the things you will learn is that the length of the mouthpiece isn't all that important. The
thought of changing the length freaks out those who've never taken tools to a mouthpiece, but in reality the placement on the cork can make up for small differences. Also, the cosmetics freaks out many. This piece will likely never be pretty, but it can easily be instructive even if resuscitation ultimately fails.
I can tell by looking at it that the prior owner learned something.