Alan, regarding KK I agree. On other hand, till now I never have seen such a groove on something Wedhung-like outside of Bali.
Another place, which comes into mind seeing such anomalies, is Lombok (which Kai mentioned). On page 339 in "Keris di Lombok" there are pictures of spearheads of similar bent shape, one, perhaps two of them (the picture quality is terrible) most likely with back groove. On page before a Golok, which isn't bent, yet otherwise has perhaps the closest blade shape, with back groove too.
This object in question so obviously doesn't fit in any parameters, that it almost seems to be made to rise curiosity (and perhaps its price).
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