From the pictures, the blade appears to be European and the "Indian Ricasso" is the result of repeated sharpening & repairing of the edge. Moreover, the wear of the blade matches quite well the corrosion of the hilt, so my guess is they have been together some very long time (18th century?!). However, I might be wrong.
Anyhow, let us not fall into the trap of calling every single sword with an Indian, disc pommel, a "tulwar" because then we will end up with a lot of confusion.
Then we may very well call "tulwar" all the swords in the photos below, when in fact they are very different swords.
So, in naming a sword, I will give priority to the blade and call the swords below:
1. Tulwar
2. Shamshir
3. Tegha
4. Khanda
5. Sousun Pattah
But this may be only my narrow and stubborn point of view... yet, it is stubborn indeed!