Unusual dagger, billfish or bone “blade”?

[David]

Well, it certainly isn't too long to be a baculum, as walrus oosiks can be quite large, but it does seems far too straight for one and i do not believe that oosiks have nerve holes running through them as shown in the above photo.
A filed down swordfish rostrum makes more sense and as you can see in the cross section CT scan, the holes at the base correspond with the frontals in that illustration.