Thank you for kind words
BluErf and nechesh: thank you for your opinions and photos.
Few answers: there is no sheath

I wouldn't be surprised if it was older than 19th century, but I'm not assuming it either. This kris is from the very, very good collection, of one of the famous noble Polish family. "Unfortunately" they gathered mainly European firearms and some Polish weapons, but you can find there also few other things, like this keris. Because they didn't left any clues about these pieces, I can't tell you how they purchased them and when.
Regards!