Hello Oiluj13,
Welcome to the Forum and thank you for posing these questions.I would suggest that the two Luzon knives (which you call a "twin set") have been left to the elements and insect predation in the past. The damage to the horn hilts is usually caused by horn beetles. Both blades also show heavy oxidation, which makes any assessment of the underlying blade very difficult. While I can understand a desire to retain the age patina of a piece, the only thorough way to assess crystalline structure of the steel is to remove any oxidation and then etch the blade. This means polishing the blade back to white and etching it with an acidic solution.
It is hard to judge the age of the "twin set" but I think they are both 20th C and perhaps post-WWII. As such, they are likely made from monosteel and leaf springs are a common stock source.
The smaller dagger may be an Ilokano knife from northern or central Luzon. Again, it is too oxidized to assess IMHO. I would suggest that you also polish and etch that blade if you want to see its metallurgical features.
As noted, the obviously laminated blade is an Indonesian keris from Java.
Your three Filipino knives from Luzon need some care if you plan to keep them. Although some of the oxidation appears old and not particularly active, I would nevertheless suggest removing the rust (either mechanically or with an acid treatment) and oil the blades.
Regards, Ian.
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