nice barung, maurice. congrats! the one in juynboll's catalogue (pic below) has a similar (broad) scabbard 'throat'. perhaps you can find out the details from the catalogue and share it to us?
when i went to museo oriental in valladolid in spain, they also have two of such barungs which scabbards are almost exactly the same as yours -- i.e., wide 'throat' (upper part of scabbard), and stylized butt end (bottom of scabbard). the museum's curators strike me as meticulous in their description of their items. thus perhaps your barung is filipino after all. but the two barungs have the traditional silver sleeve, by the way.
i'd really be interested in how juynboll described the barung below. thanks in advance!