Hello Neil, and may I add that this is a very interesting dagger you have found. Like Gav, I would very much like to see more images of the butt and tang of this piece to help in its identification. Now for the blade itself, I do not believe that it was ever part of any bayonet but instead is a common style from both the Philippines as well Spain and other areas that were once under Spanish rule. The faceted hilt is also very Philippine in style while the guard is more Chinese in appearance. This piece could very well be a Chinese/Philippine influenced design and possibly from Luzon. Like I stated earlier, more pictures of the end of the hilt would help in identifying it place of origin.
Robert
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