Lucky Crud!.....er.......I mean.......congratulations!
Seriously what a great find!
In the kris in question, the pommel looks more to be either white metal or , and I think this likely, a lower grade of silver with lots of tarnish (which can be more yellowish in lower grade silver). Needs to be polished first to see (and a jeweler could test it to be sure).
Swaasa - yes the formula for it varied between the different hues desired (and perhaps costs). Sometimes a metal can look like swaasa, but in the end is a high copper/low silver alloy to appear as swaasa.
The baka-baka appears to be copper or a copper alloy.
Intriguing for a Maguindanao to have a barong (or perhaps it is someone else's barong that the US soldier picked up as well).
Thank you so much for posting and looking forward to more posting of these newly found friends of yours! Salamat!