Unusual dagger, billfish or bone “blade”?

[Athanase]

For me it's clearly swordfish
I cut several thin sections from swordfish rostrum (Gladius) and the internal structure is really similar. There are 5 other species of swordfish and the Blue Marlin have a rostrum more round in section with tow canals in the rostrum.
On the rod the sharp edges of the rostrum have been trimmed to obtain a round section.
As for the baculum in the museum picture, I really have doubts about the identification. I've never seen any baculum that looks like that (and I work in a natural history museum, so I've seen those of many species).

I had some image of cut section of various fossil rostrums of Marlins (from Miocene and Pliocene of Panama).