Hi Jens,
That was exactly the reference I looked at. So then this is not bidri work on this hilt nor does it occur on hilts especially tulwars.......and this would be 'silver koftgari'? If you have not seen bidri on tulwars.....then that is the final word as far as I'm concerned.......nobody knows tulwars like you do!!!
It sounds like the difference between bidri and silver koftgari is similar to that of tom-ay-toe and tom-ah-toe, but as I note, these particulars are outside my field.
All the best,
Jim