Roman dagger.

[Tim Simmons]

Forthcoming exhibition at the British Museum February 2024.

https://www.britishmuseum.org/

[Bob A]

I'm gobsmacked.

Lucky you, to be at hand for this. Hopefully, much more will be forthcoming.

[kronckew]

Museum photo from the link describes it as a Gladius, not a dagger. Looks like a Mainz variant. Shame it doesn't give any dimensions.

Scabbard is outstanding. Especially as it's 2030-odd years old (Tiberius).