Philippine cutlass/dirk/???

[Robert]

Here is another odd epray find said to be from an estate sale. Being that it is so unusual I thought that I would post this to get everyones opinions. It looks to be from Luzon, but with a blade shape that I have never seen before on a Philippine sword. I cannot find any evidence that the blade on this has been reshaped from a straight blade to this style. The blade on this piece also shows some evidence of being used. Whether it was done in actual combat or just someone playing around there are several nicks that look to be from blade to blade contact and one area where it was struck hard enough to de-laminate a small area of the blade. Here are the measurements;
The horn hilt on this is 5-1/4 inches in length and the blade is slightly under 1/4 of an inch thick at the hilt. The length of the blade measured along the cutting edge is just over 20 inches and is 1-1/8 inches wide at the hilt.
I believe that a blade of this shape could however be used to great advantage in tight quarters fighting such as found onboard a ship and that is why I am thinking that this could possibly be either a cutlass or dirk. One last thing, the blade is beveled on only one side with the other side being flat. All opinions and comments would be greatly appreciated. Sorry about the quality of the first couple of photos.

Best,
Robert