Just saw this post...no, not the same mei as Seisui (Seisui signed in reisho script (much more "scholarly" than this mei).
I get the feeling I have seen this mei before but sorry, I can't remember the post now.
The two characters (katanamei) can be read Toshitake...or Nobutake...(the first can also be read Shin, Furu, Furi). I checked the books and cannot find the first character in any swordsmiths name, so, sorry, I can't help.
The long inscription seems to start with a lucky name " _ _ maru" followed by a company or association name.
Sorry, can't be more helpful. This is one for Morita sensei.