India dagger/knives

I don't now if you can see the stamp. its stamp
India. I have 90 total in my collection. each one is from India. there all made in India. I'm searching for the town they were made. I have on that says, when I bought it, it says its from the 17th century. ones from the 1820s. I want facts. I'm looking for a person that has knowledge of these. I'm running in to brick walls. ill try to take a better picture of the blades. I enjoy y collection. there absolutely beautiful. in the last page you'll see a knife that has the locking mechanism in the left side. out of 90, that is the only one I ever found. I hope you can see it. ill take better pics.