Thread: What the heck do i have here!!!

So, i picked up my first antique store hone yesterday. I got it home and cleaned off the top. It is Very smooth and hard and a green/grey...olive color. i put a razor to it for final hone this morning, it passed all the tests...i think it was the nicest shave i have ever had
I thought I would post it here to see if any of you guys could help me out by getting some kind of ID on it.
I have no idea what it could be.
thanks for your help