Hi "mahratt"
you 'r welcome
India weapons it's not too much my field
my comments will be what I found in my doc
your "Chilanum" seems more 17th than 18th century, or in middle of both, this was a favorite dagger of the Marathas of West/Central India
and, I love the elegant shape of the blade
hope so that you will have more things to share with us
à +
Dom