It's a curious sword. I can't quite get a bead on it. Perhaps it is a claymore. It could be genuine, I could not say. Maybe it has been assembled from new and antique parts hence the confounding appearance. I'm really not sure.
There are many excellent appraisers and antiquities dealers out there who may be able to provide you with a clear answer - Oliver Pinchot, Harvey Withers just to name a few.
I'm notoriously reluctant to give firm answers as to date and authenticity without metallographical examination, as so many strange swords, long written off as too good to be true, have, after modern science has had at them, them proven themselves to be genuine.
A little Indian brave who before he was ten/played war games inthe woods with his Indian friends/& he built a dream that when he grew up/he would be a Fierce Warrior Indian Chief
Many moons passed & for the boy the dream grew strong until tomorrow he would sing his first war song/& fight his first battle/but something went wrong
Suprise attack killed him in his sleep that night
And so castles made of sand/melt into the sea/eventually
I'm normally quicker to respond, but I've had my hands full and have not logged in as regularly as I normally do in the past month. Things have regained equilibrium now though so I'll be more able to reply in a timely manner.