I agree with Rick. This keris has been re-hilted with a rather nice looking piece at that and the sheath is also fairly new. My guess is that this was not a datu blade at all, but something more common place. It is obviously a pre-1930s style and likely 19thC, but IMO the workmanship is not up to datu class blades. It is not unusal for old blades like this to be spiced up with fancy dress to make them more appealing for sale. Still a nice looking kris that i would be happy to own.
