Problem is the bayu's which are very rare also appear in various styles and shapes.That makes a study to them not easier.Most museums has only one or if you are lucky two in their collection.But if those two are totally different the only thing in common is that they are double edged and have a spearlike blade.
I think ( no proof anywhere) that bayu's originally has there roots in the Ngadju area or at least in the south of Borneo.
On the fist one you listed Michael I
think its a Ngadju type.They seems to like to design weaponery with more or less Janus style symetric handles.See also some Dohong and dohong related daggers.
Strange thing is that some bayu's has the normal mandaushape scabbards while others have a specially designed one for the double edged blade.
Well at least these two Bayu's has found their place into a collection wich like to do some serious study on them.Lets hope in the future that more Ebayers list such nice " african swords".
