Good review of a nice pen, and great pictures!
I could see that this nib is one I have some spares of, and I just mounted one in my Swarna because it's nib tips broke due to corrosion...
I'm surprised you find the nib springy - and I can see it in the writing sample too - because mine is quite stiff.
The colors of your pen are beautiful, and that cap... Enjoy!
Thanks a lot for the appreciation! I wondered about the springiness too when i first bought it because not only the airmails but most of the Indian nibs are expected to be stiff and not to show line variation. However, this required some pressure to bring out the line variation, which would not be comfortable for much longer.