Flavio,
I'm not an expert on the field of the golok. The mouth piece matches with the hulu. Same dark color and wood structure. Completely different from the rest of the scabbard. That's what I see on the picture.
The Tjikeroe golok is very well executed and seems to have some age. Still the Tjikeroe writing is done for souvenir purposes for, probably in this case, the Dutch soldiers. Writing name of the place and the date is not common on Indonesian blades.
Take a look at this thread about the Tjikeroe swords. Your golok appears there as well.
http://www.vikingsword.com/vb/showth...light=tjikeroe