Chris,
Here is a list of books. Some have been reprinted and some not.
http://www.vikingsword.com/vb/showth...lborough+House
When it comes to the hilt of you tulwar, my warning about the grain of salt is still valid. I had a look ain The Marlborough House by Hendley, which is a catalogue over the things prince Edward got when he visited India in 1876-76.
A lot of weapons are shown and two of them have hilts like yours.
One was given by H.H. The Nizam [of Hyderabad, Deccan], and the other by H.H. The Raja of Mandi.
So far we have three different places, and I am sure I can find more places. There is no doubt that these hilts/swords were in the different armouries at the time, but from where they origin is still an open question.
No 1 is from Case A, and no 149 is from Case G. Sorry for the bad quality.
Years ago I have uploaded all the Cases tot the forum, but I cant find them any more.