Bear with me on the question but in short, what is it? And a Keri? I'm asking because I am in receipt of two blades my father in law had which he apparently picked up during the war (41st Div, Australia to Japan). One is similar looking in the handle, scabbard/sheath (wood carved) and brasswork. I need to post them to see what I am looking at.
the keris (also spelled kris, creese, etc.) is an Indonesian/Malaysian/Philippine form of knife/sword frequently containing a number of curves in a sine wave form, always an odd number. the indonesian/malay versions usually are slender thrusting weapons rather than hackers/slicers, while the more sword like Filipino (moro) versions are slicers that could (and did) cut people in half. most are actually straight and un-waved like the one shown on the Japanese site. the unsymmetrical flare at the grip end of the blade is in the form of a guard to protect the users hand. the longer side is 'up' and the pistol grip twisted so that you can grip the blade between thumb and forefinger, there is normally a depression in the blades 'flair' for this.
the fancy versions are pattern welded, the malay/indonesian ones usually containing layers of high nickel metal. they are then 'washed' in lime juice (acid) and then limejuice and a natural arsenic compound to bring out the pamor, the patterns revealed by the layered steel/nickel which are deliberate and quite striking. the Filipino ones are generally pattern welded in the viking form, a twisted core of hard/softer steel with harder edges welded on, all kept bright white for combat.
the scabbards of the malay/indo ones are made of fancy grained woods, sometimes carves or covered on a decorative brass/gold/silver cover, but usually arranged to show off the fancy wood grain. the grips are usually decorative in their own right, being carved wood ivory, or precious metals, and can have jewelled sections. the owners usually decorate their keris according to how rich they are at the moment, and may sell the keris's 'clothes' to raise money, or buy new clothes for it when they are flush.
thus an old blade may be found with new clothes, or a new blade with old clothes, the grip parts are not glued or pinned on, being held by a friction fit or by wrapping in braided hair or cloth (mine is held by a piece of silk batik wrapped and then pressed into the grip) they are an artform with their own specialist language, a bit like nihonto.
my Maduran Keris Untu Walang, dapur: tilam upih, pamor: untu walang,
scabbard: teak, ladrang madura style, loa 24", wht. 430 grams
the malay keris is a magical blade, and may have a spirit living in it, most are good and protect their owners, some are malevolent and dangerous. most keris are washed ceremonially every year and oiled in fragrant flowered oils to appease the spirit within.
the Filipino moro keris, generally referred to as a kris to differentiate it, (all western spellings, the locals would not differentiate) being a hacking, weapon, generally has a more robust grip and usually has brass or other metal bands/straps to keep the blade attached to the grip during heavy swings and impacts. the more delicate keris is/was used in a thrusting manner and does not need a strong tang. the active link in my post above is a good reference, a bit technical tho. another good non-commercial reference
is the
ethnographic weapons research site
some indian/nepali, and even western swords may be found 'waved' (the flamberge two handed swords were popular amongst the late middle ages) HI occasionally offer a wavey blade as a 'special'