Hello Timo,
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				Anthony Tirri, in his book "Islamic Weapons", says that these sickle style knives are from Malaysia region and are called  `ARIT`( page 412, figure 290 A).
			
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 This is not an arit and likely not from the SEA archipelago - I'd guess at India and neighboring regions.
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				Though I bought almost a similar one you have from South- India ( Kerala) and seller said that it is a farming tool ( sickle).
			
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 Would love to see that, too!
Regards,
Kai