Like many Indian and Japanes cameras this one is almost certainly derived from a Houghton field camera design, Houghton's had a factory in India.
It's quite probable the camera originally had a back that took book-form plate/film holders which is why it's been changed. In the 1930's F.Charten in Kobe later Osaka, Japan, exported Asuma's and other locally sourced field camears sometimes under their own name.
I think you'll struggle to identify this one, it may be a post WWII Japanese camera, what do you know about it's previous ownership ?
Ian