I am not sure if that Masamune tanto is actually for sale from @Ray Singer though is it? I always thought this: https://swordsofjapan.com/product-category/swords/?orderby=date was his list of swords. Maybe he can clarify but some of the swords listed on the Nihonart.com page are from other people, like this Rai: https://nihonart.com/portfolio/juyo-rai-kunimitsu-katana/ is (or was) actually Bob Benson's: http://www.togishi.com/store/p506/Rai_Kunimitsu_Juyo_Token.html