sorry, a little late coming in this party, but yes, i second the
Datu Piang translation, via a good friend of mine.
Col. J.T Van Orsdale was involved in the pursuit of Datu Ali, who, ironically was Datu Piang's son-in-law. Datu Piang was the ultimate politician at that time, siding with the Americans, for financial reasons. it was a custom of his to give foreign dignitaries and VIP's a souvenir, like a kris in this instance. this was intimated to me by Datu Piang's granddaughter. according to her, the Datu would have this room full of krises, lantakas, etc. just for this special reason.
as far as the gentleman who translated the Arabic script:a Maguindanaon friend who's wife is related to Datu Ali. big props in helping me out with this.
Ian, the gentleman in the center is not MG Wood. i'm attaching a picture of the General for future reference. also, i'm including a picture of Datu Ali.