Wow, once again sorry for the delay in my response, but so happy to those who have continued to help. Great painting, Gav, and a fascinating knife you've found, Fernando! What is it, and where is it from? The second lobe of the "heart" shape is more pronounced on mine, of course, but I'm curious as to the function of the one you've found, whether the inside is sharp, etc.
Another interesting knife with some similarities, clearly Indian, just ended on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=290287591758