How old is the kora, and from where did it come?
 

Ok - I cant ansver any of the two questions, but should someone be interested in researching the subject, I can come up with a hint.
In A Catalogue of Arms and Armour in the State Museum, Hyderabad. A.P., 1975. M.L.Nigam writes.
"In the eastern part of Deccan, some new weapons seem to have been inreoduced to suit the regional needs of the People. The 'Kora', which could produce deadly blows with its forward-curved and broad-tipped blade, appears, for the first time, in one of the sculptural panels carved in the second gate of the Mukhalingesvara temple at Mukhalingam, the capital seat of the Eastern Ganga monarchs.
The temple is datable to the second half of the eight century AD. It may, therefor, be presumed that 'Kora', the favorit weapon og the Gurkhas, had come in vogue by the middle of the eight century AD."

The author, unfortunately, does not show any pictures if the panels, but long ago I have seen a relief from South India, showing a soldier with a kora like sword.

I knew we har had a discussion like this before, but not that it was exactly the same:-(. http://www.vikingsword.com/vb/showthread.php?t=10050

On my latest visit to Nepal I came across a different and to me a more plausibe view to the visit in 2009.
Speaking to my kami about the khunda/khuda (pronounced Kora), they firmly believe that the khunda was a development of the khurpa utility tool, this makes sense when you look at how many khunda look like khurpa, and how easily the design of the khurpa lends itself to the development of the khunda

From a video of my latest visit, note the shape of the khunda

Sirupate, I have now and then been wondering if the kore really had been travelling from South India to Nepal and Tibet, without leaving any traces along the way, so your last guess may be the right one.
Strange that a weapon as dangerous as the kora stopped being used in the south.

I guess we will never know for sure, but what the kami had to say seemed to me to make sense

Sirupate, do you know when the kora was first used in Nepal and Tibet?
It is a bit strange, that a weapon of this strange kind, was used in South India, in Nepal and in Tibet. Maybe not at the same time - but still.

Hi Jens, I'm afraid not, and to be honest I doubt anyone does