Shaihai

Hello I have purchased this sword in Japan about 5 years ago. I don't know if i got a good deal on it and was wondering how much it might be worth. I am looking for selling it so your estimate is of real importance to me. I don't know much about the sword besides the fact that before me it belonged to the formers okinawa minister of culture. By the signature as you can see, it was made by niho kiyosada. I am adding some photos of it, looking forward to your estimate. Thanks S.h.