Japanese Arisaka bayonet maker

[Katana]

Can anyone possibly identify the maker of this Arisaka bayonet I have in my collection.
Thanks in advance.

[AndyB]

R.LaBar book speaks about Aisan Kogyo Arsenal, or known as Nagoya triangle. Made only 2 version, this is A type with blank blade, estimated production is around 350000 pcs.

[Katana]

Ok thanks AndyB.

[08SMLE48]

Also looks to be a bayonet used on training rifles. I’ve read that those had polished blades with a more dull edge while blades intended for combat were finished with a dark, almost black bluing, and had a sharpened edge.

[Rescue190]

IMHO it is a arsenal issued standard bayonet and not a trainer. Bayonets from this unknown maker came if both bright and blued. Most training bayonets are not arsenal marked.
John

[Shabadabada]

Actually, the maker of all "Triangle" marked bayonets is Riken Kozai. Most have bright blades, only the very last ones or later reworked examples have blued blades.
I would be interested in seeing the pommel markings of your bayonet, or at least its serial number. Thanks in advance.

L

[Katana]

Pic of pommel.

[AndyB]

42 series and serial number , R.Labar reports blued ones on higher number. On older pages it was the maker designated as unknown. Probably R.Labar made there error about the maker.