Congratulations Valjhun, it is certainly a very attractive piece, with all the bits present, i.e. the spike, the nasal bar, the plume holders, the mail camail etc, often one or more of these is missing or damaged.
My guess from the shape, the length of the mail camail and style of decoration is that it is Indian, mid to late 19th century. As to which part of India though i have absolutely no idea. India had many regions with many different local styles of decoration. B.I. might be the man to ask where Indian armour is concerned.
My guess is that the mail is unrivetted, am I right?
I would love to own one of these babies BTW, but with a wife, 3 kids and a mortgage that is a plan for the distant future. I am green with envy.