This is an interesting old sword. It is a high end, pre-1800 Moro blade with an old Waray scabbard and hilt. The scabbard is in a style seen on old
garab, including the fluted carving and the small round insert near the toe on both sides. The mouth has been widened to accept the flared
gangya area of the blade. The hilt is also of a style seen on some old
garab.
The blade was a very good one, although much pitted over time. The central panel does not appear to be twist core, however the sinuous design with many small "stars" inset at regular intervals down the blade suggests that the central panel is depicting a centipede. IIRC, the centipede was an important creature in Maguindanao mythology.
The carved area at the base of the blade follows Indonesian
keris from the late-Majapahit period, and is similar to that found on a 16th C Bugis
keris that was
discussed here.
Better pictures will come after it arrives.
.