Hello, I would like to introduce you to my surage katana with a takashi shinogi; this results in a section that looks a bit like a rhombus.
I have read that the important shinogi were characteristic of the Yamato style, and associated schools (Uda, Mihara, Nio, Kongobei, Naminohira). Some blacksmiths are also known to have forged their blades with wide shinogi.
However, the blade is Saki-zori with an 11mm sori which should (when it was ubu) be around 20mm taking into account the shinogi which extends into the nakago which is rather typical of Bizen.
Of course, it is probably impossible to determine a school without holding the blade in hand. My question is more general: Is it fair to think that because of the broad shinogi (shinogi takashi) the blade is Koto ?
Could this blade in particular be early Muromachi or even older ?
Is the temper line Sugu ?
total length 79cm
with a sori: 16 mm
Nagasa: 62 cm
With a sori: 11 mm
Moto-kasane: A = 0.60 cm
B = 0.49 cm
Saki-gasane: A = 0.38 cm
B = 0.28 cm
Moto Haba 29mm
Saki Haba 20.8mm
Kissagi: 33mm shu kissaki
Hada: Masame / itamé ?
Possible school Yamato ?
Saki-zori weak because she is surage
blade weight 515 gr
Mekugi: 3
Thanks for your help
Henri-jo