Hello David,
I agree nearly with everything Kai has stated.
It's a pedang most probably from Lombok. The fittings are like Kai stated from mamas but I guess that the handle fittings are all from mamas and from the same age since the engraved flowers are very similar.
The blade isn't overcleaned IMVHO but can need further polish before you try an etch. When you don't want to use a chemical etch try to etch it with instant coffee, with a little luck it will work. It's a very nice blade!
Attached are my own pedang collection from Lombok, only the second one from up is a pedang from Sumatra. The two in down and the third from up have as well fittings from mamas, the others have silver fittings at the handles.
Regards,
Detlef