Question: what type of mandau is this?

[Godfried]

Originally Posted by kai

Yes, I'm with you on this one, Godfried:

If both sides of the blade are (convex) rather than )concave+convex) and it's stylistically Iban rather than a few ethnic groups limited to Sabah and northern Kalimantan Timur, this label seems suitable...

Is it known from where in Brunei this piece hailed?

Very detailed work on this blade! Backside of the blade as well as scabbard?

Regards,
Kai

Thanks Kai.
Unfortunately it is not known where exactly it comes from Brunei.