My Birthday Present: Knife for ID Please

[CourseEight]

I received this beauty tonight and luckily my mom saved the auction pictures. I'm totally at a loss as to where this might be from, how old it is, etc. I'm posting it here because it's my understnading that these cast brass handles are 1800s Europe? The blade has the man in the moon, suns, and panoply markings; I think they seem copied, and not original trade markings, or is this not the case? The extreme curvature of the blade and the unusual tip is fairly unfamiliar to me.

Thanks in advance for any help!

--Radleigh