(Let's hope this works)
From Hatsumi's Togakure Ryu Ninpo Taijutsu book from 1983:
You can see the name ichimonji no kamae (一文字の構え on the bottom right.
And a close up:
From Hatsumi's Hiden Ninja Submission from 1981:
and the opposite page which lists it as ichimonji no kamae:
and a close up:
If the links don't work properly I will have to do some resizing.
From Hatsumi's Togakure Ryu Ninpo Taijutsu book from 1983:
You can see the name ichimonji no kamae (一文字の構え on the bottom right.
And a close up:
From Hatsumi's Hiden Ninja Submission from 1981:
and the opposite page which lists it as ichimonji no kamae:
and a close up:
If the links don't work properly I will have to do some resizing.