Tousui?
I also like this pot. It's got some nice patina starting to form!
There are two things however, Tousui is a Seto-ware potter, not Tokoname, like his father and uncle, both also very famous potters. The other thing is, I don't recognize this chop as the modern Ryukujan Tosui, so it could be his father, the patina definitely looks it.