I recently came across a notation on Aoi Art website indicating that the following Ichihara Ichiryushi Nagamitsu signature is quite rare:   Bizen (no) Kuni (ni) oite Karasujo (no) shita Ichihara Ichiryushi Nagamitsu Saku   Attached pictures show a Nagamitsu with the very same/similar signature that was restored in Japan many years ago and it is also dated Showa 19 nen 10 gatsu kichi jitsu.   The reference to Karasu-jo in Japan is an interesting one. Karasu-jo is "Crow Castle" in Japan,