Nakayama Mizu Asagi (30, 75, 185) and Nakayama Kitta with Nashiji pattern (43, 70, 270). Both stones are very fine and hard. The performance is close to each other and will give you a mirror polish. The Mizu Asagi is very clean without any lines or cracks. The Kitta Nashiji have some lines but nothing toxic. The Mizu Asagi is probably from the same layer or source with the one I saw from Watanabe because they do have the same sign on the side. The Kitta Nashiji was brought from Aframes Tokyo about 2 years ago (I cannot find the sold product on the web but only one photo saved before).
Nakayama Mizu Asagi: $300 shipped north America
Nakayama Kitta Nashiji: $600 shipped north America
Nakayama Mizu Asagi: $300 shipped north America
Nakayama Kitta Nashiji: $600 shipped north America