Recently one of my colleagues in workplace found this pen. It seems to me that this one is a Parker Duofold Senior from 1926. The nib is in excellent condition and writes smoothly. However, the sac inside has dried and crumbled. I was wondering if it would be possible to find a new sac in India. If such is not possible I would like to know whether there's any website where I can order for parts. The pen body seems to be made of ebonite whereas the blind cap at the back (which covers the button) seems to be plastic.
Note: I could send the pen to Pen Hospital in Kolkata, but I had a prior experience of the nib getting damaged following the repairing of the sac of a Sheaffer. So, I am hesitant to send the pen to them again.