Hello Jim
Thank you very much for a very very informative post, I now not only have a possible source of origin for my recently acquired sword, but also learned of a criteria to help distinguish other pieces later.
Also, thanks for the reference to the book (Indian arms and armour) I will try and locate a copy.
I have also noted from looking at examples of sold tulwars on oriental arms, that tulwars are not usually that curved.
http://www.oriental-arms.co.il/search.php?q=tulwar
Regards
Bally