Kiita Japanese Nakayama odd shaped Awasedo hone stone, hand sawn sides and back
 
Authentic Kyoto Honyama kiita razor hone. I do not know which mine this stone came from, but I have tested it out by honing several straight razors and shaved with those razors leaving a smooth shave, This is an excellent Mohs scale #3 hard razor hone. 
There is no kawa (skin) to guide which mine but the hand scraped sides indicate it is likely early 20 century. This stone is from the Air Raid Shelter Hoard which I bought and emptied about 5 years ago.
Sold with a money back (minus the shipping) guarantee.
This stone is a modest hand-held size at 20 x 5 to 6.2 cm long,,by 27mm thick.