Great catch Ian! According to the Control of Weapons Act 1990, a controlled weapon is partly defined as “a knife, other than a knife that is a
prohibited weapon”, which this falls under.
My only concern is regarding the lawful excuse, is it safe to assume that “holding koshirae together” or “holding seperate sword fittings together” will be understood properly to someone unfamiliar to nihonto? I don’t think it could pass as a kitchen knife…
The penalty dealt if the lawful excuse isn’t accepted is pretty hefty… 1 year of imprisonment sounds like a baaaaad time.
Any suggestions would be appreciated, thanks!