The swords being listed by this seller are rather perplexing. He's able to consistently list a large number of swords that are either "masamunes" or "sanjo munechikas", etc.
The thing is, the swords are actually rather nice, with lots of koto looking activity in the hamon, and sometimes even having koto jitetsu. But many of the swords are extremely healthy with ubu nakago, long nadasa, thick kasane and prominent hamachi, so it leads me to believe that they're shinshinto copies. But they're really good quality shinshinto blades. And he's able to get some pretty good prices.
Does anyone here think that these blades are indeed koto? Or if not, how the hell is he able to get his hands on so many high quality shinshinto blades?
Here's his current live listing, a "Rai Kunimitsu":
https://www.jauce.com/auction/f1191102591