Rick
Those Balinese Ceremonial knives nowadays usually look like what Zonneveld calls Wedungs from Bali on page 153. I have one of these which I have previously shown at this link.
http://www.vikingsword.com/ubb/Forum1/HTML/000732.html
(Don't know why this didn't come out in color.)
These knives are used in the opening of the coffin in cremation ceremonies.
The piece that Zonneveld shows on page 74 is a much higher grade piece which was acquired in 1895 and is probably not now the norm except in the finest circles.
The only similarity I see with the one on the back cover is the general outline of the cut on the top of the sheath. I know that the actual cut for the blade is muxh wider than that for the piece that I have shown here.
rahman
The blade is definately a pedang. The pamor is a puzzling. The entire piece is puzzling.