User blog comment:Inept Wiki User/Cosmos in the Lostbelt: Post-Prologue, Pre-Anastasia Information & Speculation/@comment-4616657-20180327163507/@comment-34352073-20180327182751

I would argue that it's too soon to go around calling it a katana, given that Servants don't exactly have historically accurate weapons for the most part (even outside of NPs). So basically the same argument as Hitsuji's, but for weapons instead of clothing.