People and blades travel, since the beginning of time. I got 3rd-4th century AD crucible steel blades in the Caucasus, and well as later period ones in the Altai of Siberia, and those were overland travel. It is highly unlikly it was made in the Philippines, but reworked is plausable. Boats and trade have been going on for centuries in these places. Things travel, particularly something like a wootz blade with Indian saliors.
