Hi Clockwork,
I have to say I dont think this one is very old.
I agree there are 19thC chevron etched blades, but I don't think this looks like one. I think the etching looks fairly modern (I see similar ones with very rough edges to the etching quite often) and it looks like someone has tried to clean or polish the blade to remove it. The koftgari looks new and the blue colouration of the handle would rub off very quickly in use or with age.
I see very similar 'new' daggers for sale on indian sites now, I think this one is no more than about 20 years old.
Sorry.
Regards
Gene
Heres a brand new one which is similar, I can find some pics of the chevron bladed ones if you want?