hi guys hoping someone more experienced could offer me a quick answer on this. Here is what I know, it is a sunnen model KN, the seller doesn't know anymore about it

at first thought just reading the name I first assumed it was one of the old in block grinders but after looking at these pictures a little more it looks different then any of the in block grinders I have seen and I was wondering if this one actual attaches to a lathe????????????

The guy sure ain't giving it away but and before I spend the money guessing I figured I ask if it is a actual attachment for a lathe maybe it would be worth more to me .......... you know how it is when you need something it is worth a little extra $$ then actual worth..........and when you WANT something it is wroth even a little more $$$ ...lol

I'm hoping one of you experienced people will jump in and take a look at these pictures and let me know