Hello Danny,
Well, your pictures are already a lot better than those taken by the seller.
If he had posted these pictures I would have taken a shot at it as well.
My first thought is "Gayo".
But...
There are a few odd things.
- the ivory buntut. maybe a later replacement ??
- the floral decoration on the wrangka, maybe added on Borneo ?
- the hilt, jawa demam, but not very Gayo in style.
Here a few pictures of gayo keris from Museum collections.
As you can see, the pendokok not running upto the wrangka is absolutely normanl for this type.
Ps. don't overclean the blade. If this ensemble is Gayo, the blade will not be very special and this is the normal state for them to be in. It is not a javanese keris
Best regards,
Willem