On the subject of Indian pens, here’s a list of those I found. There may be others.
Airmail/Wality, Guider*, Deccan, Kim & Co, Ratnamson, Ranga*, Varuna, Camlin*, Serwex*, Fellowship*, FPR*, Gem & Co.*, Asa Pens (Gama)*, Oliver*, Abhay Pens, Camay, Lazor*, Hamraj* and Gala.
Edited to add Fosfor Handcrafted Pens
Not all are available online but those that I have marked with an asterisk are at time of writing. I didn’t search terribly hard so it may be that some of the others are available too.
I would be interested to hear of your experience with Indian pens, good or bad.