Unusual dagger, billfish or bone “blade”?

[wildwolberine]

I’m curious to know where this dagger might be from. Doesn’t appear to be particularly old. I’m not sure if the “blade” is a billfish bill or perhaps mammalian leg bone? The hilt is the tip of a cow’s horn. The sleeve or ferrule is thin brass. It’s just held in by friction and is loose as you can see. Any input is appreciated - I know this may just be a curio or knickknack!

Overall length ~45cm
Blade length ~34cm