Hmmmm, well I was fairly certain there was liquid in it, but it is so opaque that it may just be an illusion. It also really seemed like glass too, but now I'm not sure! That was a good point about the notches, it really suggests a blade insert.
Not a great day for me...one screw driver handle and apparently I can't spell 'vial'...haha!
Thanks for the help guys, it's great to have such a resource. Hopefully next time I find something that stumps me, it will be a better find!