Well, i think it would be hard (for me at least) to come to too many conclusions about this keris based on these 2 pictures. I suggest you try to show us much closer, detailed images.
My first impression, however, is that if the carving on the ivory is good and detailed and indeed old that it seems a bit of a mismatch for the blade, which seems a bit more middle class.
How's the fit in the sheath? Do you think it was made for this blade?