Name of tow Batak Knives

[Athanase]

Hello,

I recently acquired these two Batak knives which I don't know either the name or the function.

The first has a handle similar to some Lopah Petawaran seen on the internet but the blade is much simpler.
The second one has a blade very close to the Lopah Petawaran but the handle and the sheath don't look like what I saw elsewhere.
Both knives were collected by the same person before 1941.
How would you name these knives?

First knife :
Blade length : 16cm
Handle in Saro (Capricornis sumatraensis) horn with silver
No scabbard.



Second knife :
Blade length : 23,6cm
Handle in buffalo horn and brass.
Scabbard in wood, deer horn, bone and silver.