very nice twistcore, Fernando! it appears that your collection is growing quite bit!
i love these type of twistcore: very subtle as oppose to the topographic type. i always wonder if this is indicative of the age. or perhaps it's just a particular style a panday preferred at that time. it's hard to say.
i have an archaic kris that was discussed before. it's not twistcore, but i believe it's an indicative of an older kris:
http://www.vikingsword.com/vb/showthread.php?t=15955