Question about the scabbard of a mandau

[Godfried]

Hi Kai, thanks for your reply. I know Albert . I spoke to him on Sunday at the "Tribal Art Fair" in Amsterdam.
The Mandau's are known to me. Nr-1 is a Mandau of the Long Glat (upper Mahakam) late 19th,c.. And Nr-2 is a Mandau of the Kayan also late 19th,c. I think the motif of photo-1 is the tumpal motif, but I'm curious if the circle represents the sun (surya) or a dashed head. Photo-2 is either just decoration or a stylized image of something. But of what.