Hello Bill,
Congrats again - this is really a unique combo! While the VOC blade got recycelt, I'd guess that the bahari-like gonjo as well as the Malay keris sundang hilt were crafted for this piece.
The numbers visible on your kris are the last 2 digits of the year - if you ever get access to a specialized lab, I'm fairly confident that the hidden century (1?46) can be revealed!
Actually, the markings of VOC blades are not close to the hilt - the hole is certainly not original to the European blade; I also see no reason for a keris/kris to have this hole. I don't think this is much of a distraction - pieces of history tend to be not in mint condition...
Here's a recent thread showing 2 badik with recycled VOC blades:
http://www.vikingsword.com/vb/showthread.php?t=6291
I'm attaching the relevant blade pics below:
Regards,
Kai