Rarely do I disagree with Jose, but on this occasion I think he is mistaken in his attribution of the blade to the Maguindanao, at least if we are to believe Cato's classification.
Attached is a scan of Cato's Figure 39-42,* which I have labeled A,B,C,D:
A = Sulu kris;
B = Maranao;
C = Maguindanao; and
D = a "crossover" form. A picture of your kris (attached) shows the "elephant trunk" area is most consistent with the Maranao example (
B) shown by Cato.
To quote Cato (p. 68):
The type that is distinctly Maranao begins with an elongated trunk [I think the tip of your trunk may have broken off]. The mouth cavity, while still present, is quite narrow, and the lower jaw runs parallel to the guard. While the Sulu, Maguindanao and "crossover" forms of the elephant's head/trunk motif display concave cavities beneath the lower jaw, the Maranao configuration does not.
Ian.
*Cato, R.
Moro Swords. Graham Brash: Singapore, 1996, pp. 68-69.