Hi Nacho, According to Cato, it's a Maranao (fig 40) blade. If I were to guess on the sheath wrap, I'd say Bagobo because it's red, the stick figure & the hour glass triangles. The Bagobo also liked to cover their sheaths with both bead work and cloth. I'd peel it back a bit and see if the outside is faded/dirty compared to covered areas. The hand twisted "string" under the copper looks like abaca, often used by the Bagobo but certainly not exclusively. The "rope" also looks like cotton farmed/woven in that area.
With the maddening trade in that part of the world, you would really need a expert to know for sure.
If the sheath covering & hilt wrap show signs of wear (the pictures look like it) I would guess it was most recently used by a Bagobo. If you suspect it has been altered it ay have been done near Davao City to sell in one of the Manila shops.
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