Per tsuba #6, I am not familiar with Hizen school tsuba, were they known for the rope designed rim? Curious as to the Hizen school call.
I see nihonto.us has one for sale which is very similar that they have attributed Tochibata and they make mention that Sendai Myochin also used the same design (as the one they have for sale).
Link to that one :
http://nihonto.us/TOCHIBATA%20TSUBA%20DM006.htm
Also, what are the dimensions on that one?