AFAIK there is nothing unqiue or rare about them, they are just TF's OEM configuration(s). You can also find them at Tsubaya, althought Tsubaya lists the Gyuto in stainless, they sell other shapes in both stainless and the KU iron cladd. TF webstite's retail prices were generally used/matched by the OEM dealers for many years. The KU irond clad are basic, entry level versions sold at low prices. Makes sense for TF as the OEM stuff therefore does not compete as much with his own-name versions directly on either price/features, and the knives are more plausibly 'hosue' brand in trade dress (no finger choils, etc).