Hi Jackie! I was given some beans by one of the "old boys" on my new site, I had never seen anything like them but have identified them as Orca Ying Yang. They are not black and white but a sort of deep chestnut and white. Apparently several people here have been growing them for years but no one knew what they were. You are welcome to some - I was given quite a lot. I was also advised to soak them before planting, and that they have to be germinated in pots - they haven't managed to grow them planting direct. PM me your address if interested.
Anne