Thanks Ian,
That scabbard is almost "shaver cool"... yep I said it
far too modern to gauge origins IMHO, perhaps a form seen all over the island
I feel there is mostly agreement on Sumatra at least.
You noted from the image you present were the edge is on these types?
Attached is a very fine Aceh example with an original old scabbard found in the MET. A northern scabbard phenomenon too.
Gavin